When I boot my computer I get a message with 2 beeps:

 

Primary hard disk drive 0 failure

No boot device available --

No bootable devices - strike F1 to retry boot, F2 for setup utility.

 But, after reboot it for 30 or so times. The computer will finally kick on.

 

When I ran the diagnostic test CD I got two error messages.

IDE DISK 0 - Confidence test

Result Code: 0F00 - 1348

Msg: IDE device failed: Target drive aborted the command.

 

IDE DISK 0 - Confidence test

Result Code: 0F00 - 1362

Msg: Device Initialization failed (null).

 

Also, sometime my fan gets pretty loud.