unable to turn Bluetooth on or off
If Bluetooth is stuck in the on or off setting, this simple procedure should cure the problem.
You may have already tried clicking in the Status bar icon or the System Preferences pane; perhaps you even did a Restart, all without effect.
The surprisingly simple answer is:
Shutdown the mac, and power on again.
Shutdown works whereas Restart doesn’t because – unlike Restart – Shutdown puts the Bluetooth power manager through a complete power cycle.
More Bluetooth problems? Drop a comment below!
how to secure your mac (OS X Lion)
Security in OS X Lion is a big problem that not many people are aware of, and here’s why: your Lion computer contains the install/recovery disk on the internal drive. That means anyone with a basic knowledge of Mac and Lion can start up your mac and reset your passwords, thereby accessing your user accounts and all your personal data. The same trick can help kids easily get round restrictions applied through OS X’s ‘Parental Controls’ feature.
How is this possible, you may ask? First, a little history. Among the 250 changes vaunted about Lion over its predecessor, Snow Leopard, there is one that is widely known but whose implications are rarely pointed out: you download the OS rather than install it from a disc. In the past, if your OS went bad and needed to be recovered, or you forgot your admin passwords, the simplest answer was to insert your install disk. From that, you could restore the OS and reset your passwords. That made your Mac a little safer (though not entirely safe) so long as your disc was kept somewhere physically different from your computer.
With Lion having no install disc, Apple had to find an answer as to how to provide the recovery option. The solution was to install a Recovery partition on the same disk as the operating system itself. In the event that the OS goes bottoms up and needs to be recovered or re-installed, you just restart your computer holding down the ‘command’ and ‘r’ keys to access the Recovery partition.
So far so good, but likewise, just as with the old DVD install discs, you — or anyone else — can also reset the user account passwords from the Recovery partition. That means your passwords are effectively useless. Anyone who wants to hack your user account just has to restart your Mac holding down ‘command’ and ‘r’ and then use the built-in Password Utility to make new passwords for your accounts. Now I’m not going to tell you quite how to do it (you do need a little knowledge to get the user account names and know how to do the reset) but it is widely publicized elsewhere, and indeed even in Apple’s own online documentation (so if you really want to know, google is your friend or follow some of the links in this post…).
What’s the answer to this security nightmare? Here’s one thing that’s NOT the answer but which I have seen widely touted: setting a firmware password. If you’re not familiar with the concept of the firmware password, don’t worry. It is practically useless, since anyone can reset that simply by taking off the back of your computer, and then pulling out and then putting back in one of the memory chips.
Apple, of course, thought about this problem. Their own solution is to encourage you to use FileVault 2 (FV2) to encrypt all your data. Indeed, this is the BEST solution. Without your password, no one can access the disk on your computer no matter what they do (and that includes YOU if you forget it…). However, there are a couple of drawbacks to FV2. One is that it requires extra disk space, and if you have more than one partition on your hard drive, or a lot of data, and little space you may not be able to encrypt and decrypt your data. The other drawback is that FV2 places a little extra wear-and-tear on your hard disk (though that may be negligible given the security pay off).
Using FileVault 2 is really the only security option if you’re using Lion. However, if you don’t have the space for it, there is a ‘second-best’ strategy (see below why it’s only ‘second best’), and that is to remove the recovery disk and use a clone as your recovery option instead (WARNING: the Recovery disk is required for FileVault 2, so by removing it you will also remove the ability to use FV2).
There’s a couple of ways to remove the recovery partition on your internal disk, but this is probably the best:
1. Clone your current system to an external disk using Carbon Copy Cloner. This will clone your entire system exactly as it is now, but it will not copy the Recovery disk.
2. Still booted into your internal OS (the one on your machine), open Terminal.app and paste the following command:
defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
3. Open Disk Utility.app (Applications/Utilities/Disk Utility.app). In the menu bar of Disk Utility, choose Debug > Show Every Partition.
4. In the left-hand pane of Disk Utility, you can now see the Recovery HD. Click on it. Then click on the Erase tab on the (larger) right-hand pane. Click the Erase button down there on the bottom right.
5. Quit Disk Utility.
Now you can use your bootable clone as your recovery disk if your OS becomes corrupt and no one can boot up your computer with ‘command-r’. If you keep the clone backed up on a regular incremental schedule (you can choose anything from once an hour, once a day, week, or month), you can simply restore a corrupted internal disk to exactly the same state as your last backup.
Why only ‘second best’?
As alluded to earlier, it is still possible for advanced users to start up your mac and reset the password without the Recovery partition (this was also true in Snow Leopard even without the install disc). In fact, what this procedure does is give your OS X Lion installation the same security level as an OS X Snow Leopard installation, which is not actually that great, but better than Lion with a Recovery disk! Also, if you are storing highly sensitive data, don’t neglect the fact that someone who has complete unfettered access to your hard drive could even remove the disk and recover the data using special software.
The short story is if you want to be absolutely certain that your data is secure, FileVault 2 is really your only option.
featured picture Security Workstation by digitalhadz
how to unfreeze your iPad
iPads are so easy to use, why bother with the manual? 😉 The chances are though, that at some point you’re either going to find that an app freezes on your screen or your whole tablet becomes unresponsive. Don’t panic, the answer’s simple:
First, be sure that it’s connected to a power source. The most common reason for iPads not working is people don’t realise they’re out of battery! Otherwise try these:
If it’s just a particular App that’s frozen on your screen:
— Hold down the ‘sleep/wake’ button (top right, back edge) for about 5 seconds until the slider appears. Release the ‘sleep/wake’ button. Now hold down the ‘Home’ button (bottom front, centre) until you see your Home screen.
If your whole machine is unresponsive, then do a restart:
— Hold down the ‘sleep/wake’ button for about 5 seconds until the slider appears. Slide it to ‘Off’. Then hold it down again until the Apple logo appears showing that the iPad is restarting.
If that doesn’t work, do a hard reset:
— Hold down the ‘sleep/wake’ button AND the ‘Home’ button simultaneously for about 10 seconds or until the Apple logo appears.
*For more serious problems with your iPad, such as continual restarting or no home screen, have a look here.
featured picture: ice crystals by Typen
avoiding autosave applications
If autosave is slowing you down, there may be nothing else for it than to switch from your favourite Apple app to an alternative that doesn’t use the feature. Here’s a rundown of some of the main autosave-enabled apps and some possible non-autosave replacements.
Preview –> Skim (for pdfs)
Skim is a great little free program that is based on Preview but adds some extra functionality, especially useful if you do a lot of annotations and note-taking. All the basic controls are familiar from Preview, including trackpad zooms and rotations. There’s two limitations: it’s pdf only, and it doesn’t have the ability to create hyperlinks.
Preview –> Graphic Converter (for images)
Old standard beloved by many Mac users. Note that the latest version does support autosave, but unlike native Apple apps, gives you the option to turn it off. Available on the app store. Main drawback: it’s not free (current price about $40).
TextEdit –> Tincta
Love this free program, and you can find it in the app store. Does everything TextEdit does and more. If you do any sort of coding, you’ll love Tincta. Everyone should have this!
Terminal –> iTerm2
You’re not really going to notice autosave in Terminal if you only use it for the odd command. If you’re doing anything more than that, well, you should be using iTerm2 anyway. Free, powerful, essential.
Pages & Numbers –> Office/Libreoffice
The only real answer to these outside of the MSOffice suite is the free Libreoffice.
Keynote –> Powerpoint/OpenSong
Well, sometimes it’s just the devil you know. Yes, you can’t really beat MSPowerpoint, but of course that’s a heavy investment. A free option that might be worth giving a try is OpenSong.
Tried any of these, or found your own alternative to autosave-apps? Let us know in the Comments below!
taming Versions…sort of
If you’re working with large files in Keynote, Pages, Numbers or other Versions-supported programs, and making multiple changes at regular intervals, Versions could just be eating up your hard disk and causing a big-slow down in your work.
If you want to reclaim all that space and speed things back up, go delete the .documentrevisions-V100 folder in the root directory of your hard disk, the place where Lion stores all your document versions. Be aware that this means you will lose ALL Version history for ALL your Version-supported applications. If you are comfortable with that, read on…
You need to do four things: enable the root user, show hidden files, change the permissions on the folder and finally check the folder’s contents and delete it. Here’s how:
1. Show hidden files
In Terminal (Applications > Utilities) type
defaults write com.apple.finder AppleShowAllFiles YES
Press ‘Return’, then type
2. Enable root user
Go to > System Preferences…Users & Groups
Click ‘Login Options’
Click ‘Network Account Server: Join’
In the resulting dialogue box, ignore the text input and click the button below, ‘Open Directory Utility’
Click the padlock at the bottom of the next box and enter your admin password.
At the top menu bar of Directory Utility, choose the ‘Edit’ menu > Enable Root User
If you are requested to set a password for it, set the same one as your Admin password (this ensures you won’t forget it).
Log out through > Log out (username), then log back in with user ‘root’ and the password you just enabled.
3. Change Permissions
Now go look in the root directory of your hard disk.
You should see a greyed out folder called ‘DocumentRevisions-V100’. If it has a ‘no entry’ icon on it, click the folder and press ‘Cmd-i’ on the keyboard (or right click the folder and choose ‘Get info’).
Scroll down to the bottom of the box, click the padlock, and enter your root password if necessary. Change all the permissions to ‘read & write’, and click on the ‘gear wheel/cog’ and choose ‘Apply to enclosed items’ if it appears.
Choose ‘OK’ in the warning dialogue box.
4. Deleting Versions history
Now you are ready to go and look inside the Versions directory. I recommend you have a nosey about and check the file sizes both of the folder itself and of the individual contents. Now, here’s a warning: you can’t just delete some of the contents in the folder. If you do, in about 24hrs Lion will see that the folder is corrupt and mark the whole thing as ‘bad’ and make a new Versions (.DocumentRevisions-V100) folder. What this means is that you will lose access to Versions in the UI, but you won’t get your disk space back as it won’t delete the ‘bad’ folder.
The only option is to either lock the thing back up and leave it alone, OR delete the entire .DocumentRevisions-V100 folder with all its contents.
Restart your computer logging in as your usual user.
Lion will make a new, empty DocumentRevisions-V100 folder to replace the one you deleted and start filling it up with versions you make from then on. You’ll have reclaimed your disk space (and removed all your previous versions), but you’ll need to keep doing the same process at regular intervals.
a. No, this does not affect your original saves or any duplicates. Only the versions.
b. Messing about as a root user can have serious consequences if you mess with other stuff. Do as the instructions say and nothing else unless you know what you’re doing. After you’ve deleted the Versions folder and emptied the Trash, go back to Directory Utility > Edit and disable the root user.
c. To stop seeing the hidden files, type the same command as given in 1. above into Terminal, but change ‘YES’ to ‘NO’. Don’t forget to do the ‘killall’ command afterwards.
d. If you have trouble saving documents without re-booting after deleting .DocumentRevisions-V100, try this script from Apple Discussions user Yvan. This will recreate a clean (i.e., empty) Versions folder every time you reboot, saving you the hassle of regularly cleaning out the .DocumentRevision-V100 folder (as well as preventing any ‘Save’ issues.)