Misc: Mac

Virus? On a Mac?

Yes its quite possible to get a virus on your Mac.  They are less susceptible than their Windows counterparts, but it can happen, mostly though they are installed by the user, not sneaking in from infected websites and files as is most common in Windows.

The one i’ve run across comes in disguised as a Video Codec and once installed, screws up your DNS so that you cannot get to certain websites and generally slows you down on the web.

The way to solve this little problem as noted in the screenshot answer above, is to download iAntivirus (grab it here).

One thing to note. If you are infected you may not be able to get to their website, so don’t be surprised if you have to use a different computer and copy the file over via thumbdrive.  If you are infected you don’t want to be on your network just in case you inadvertently transfer the virus between Macs anyway.  Its a simple download and install and will automatically clean your infections for you, for free.



Error Tone (two sets of different tones)
Startup tone, drive spins, no video
Powers on, no tone.
High Tone, four higher tones.

Problem with logic board or SCSI bus.
Problem with video controller.
Logic board problem.

Problem with SIMM.

Mac:  Keyboard Shortcuts when Starting UP

1.  Extensions off: hold down [SHIFT] during startup to boot without extensions.
2.  System picker: hold down [Option] during power-on if you want to select which of the installed operating systems to boot.
3.  Rebuild desktop: hold down [Apple] [Option]
4.  Eject CD: hold down mouse button during power-on.
5.  Boot OS X: hold down [X] to boot OS X (if installed)
6.  Boot from CD: hold down [C]
7.  PRAM reset: hold down [Option] [Apple] [p] [r] on startup and wait for the second chime before releasing
8.  Open firmware mode: hold down [Option] [Apple] [O] [F] to enter open firmware mode on startup. This is the easiest way of finding out your firmware (Boot ROM) version. Make a note of the build version and date (eg. 4.1.9f1 BootROM Built on 09/14/01). Type “mac-boot” (without the quotes) to continue with normal boot-up.
9.  FireWire target disk mode: hold down [T] key
10.  Force power off: hold the main power button for a few seconds
11.  VERBOSE BOOT:  hold down [COMMAND] (the apple key) [V] Verbose mode is handy because it shows all the start up processes and will let you know if one of them hangs the boot process.  Once verbose boot is complete, it will continue to startup in Aqua as normal without any further input.
12.  SAFE BOOT:  hold down [SHIFT] while booting.  you should see “Safe Boot” appear under the “Mac OS X” in the login dialog.
13.  SINGLE USER MODE:  [COMMAND] [S] – not for the faint of heart – this one should only be used by users with a good grasp of unix


Where to find Help…

One of the best places to go is always to the developers site.  After all, they made the software, they should have the best working knowledge of it.

Apple has some excellent info for their current and recent OSes…








Rebuild that Desktop

Another tip for the Mac users.

This problem doesn’t happen often but when it does, it can be a pain, so i’m posting it here just as much for myself as for anyone else…




Basically its the way of rebuilding the desktop in OSX, since you don’t actually rebuild the desktop like you used to in OS9 and earlier.  These 3 little files  LSApplications,

LSClaimtedTypes, LSSchemes and their hidden backups can be removed and when you restart many little annoying errors are fixed.  Nice and simple, and as i’ve said before, simple is always good.

Once in a while…

Your mac will need a little routine maintenance to keep everything running smoothly.  it should only take a few minutes a month, and may save you hours of trying to fix bigger problems later on.

1.  Restart.  I know, many people will tell you that you do not need to restart a mac running OS X, which is nearly true.  You don’t need to restart as often as with earlier Mac OSes, and no where nearly as often as windows Oses, but once a week or so is a good thing to help clear out the garbage.

2.  Run the CRON Jobs.  This can be done in the Terminal, or by using one of the numerous freeware apps out there.

3.  Empty your caches.  Many of the caches will get cleared out by numbers 1 and 2 above, but every once in a while it’s good to empty your Safari cache if you haven’t restarted for a while and have been surfing alot.  Safari has the option to “Empty Cache” right in the main pull down under the word Safari.

4.  Repair Permissions.  This is one habit i strongly recommend you get into before and after installing any updates, even Apple updates.  After repairing permissions its always best to restart your mac.


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