Mac wont boot, auto restarts after about 10 seconds

Hello,
My friend's mac has broken and it starts to boot for about 10 seconds, then auto reboots. He has tried booting in safe mode (holding down shift) but it doesnt change. Does anyone know how to fix it? He thinks it may be a virus, so is there a way to get it working so he can install AV software?
Thanks, Black_Sirrah239

Great Help so far, just to add...
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, 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 at top of the screen. (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. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). 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.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitirion & use Disk Utility from there.

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>>> Marcel Cox<[email protected]> 07/01/2007 20:47:06 >>>
Nanu Kalmanovitz wrote:
>
>Can be the "auto restart after abend" during the loading of NLMs be caused
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Mac wont boot, auto restarts after about 10 seconds

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