Computer is shutting down right in the middle of things rop

Question

It was doing this about a month ago. Just completely shutting down in the middle of the internet, iphoto,etc. and it wouldn't go to sleep, but kick off. I took it to the apple store and they said it was the power supply and fixed it.
Then yesterday, I was on the internet and it just kicked off, like the electricity went out, but it didn't. Just the computer went off. What could this problem be? hopefully it won't start doing to too often. Can the internet cause something like this? I wasn't working it hard or loading things up....
Message was edited by: FM/AR

Answer 1

Hi FM/AR,
Not likely the Internet could do it by itself, but what exact Mac do you have?
Boot off your Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some models have a separate AHT CD.
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.