Major Pc Problem

Last week I was using my PC as normal when it just shut down and restarted itself, so i tried rebooting and it said there was a problem with booting up, so i put a startup disk in and had a look on drive c and it was empty, apart from the default files on it. i thought i had lost everything but then i rebooted and it loaded up normally, so i backed everything up but it did it again, and it got worse cos the hard drive wouldnt even boot up and the monitor wouldnt work. we eventuallu diagnosed it as a problem with the motherboard (no viruses on the HD) .I got a new motherboard last week and formatted my PC and everything seemed fine, until 20 mins ago when i was playing champ mananager and the Pc rebooted and came up with the message "BOOT FAILURE, PLEASE INSERT A BOOT DISK" what the hecks going on? is it the hard drive? luckily i kept rebooting and it eventually let me log onto windows again, but i dont know when its going to happen again. please help!!

Could be a good few things, hardware or software.
Since you got yourself a new motherboard, then the BIOS battery failure is out-ruled.

Can you try another IDE cable for the drive?
Are/is the hard drive/s displayed properly in the BIOS? e.g the bootable partition is in the boot-up sequence?

You could try booting to a command prompt and doing a "FDISK/MBR"

All the best

just happened again, came up with the message

Verifying DMI Pool Data............

Boot from CD:
Boot from CD:
DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER


I changed the IDE cable a few mins ago and it has been ok, so far

Your bios will more than likely try and boot from cd when it cant boot from hard drive C in most cases. Try starting in dos and do a thorough Scandsik (surface test) on it, takes a while. If thats ok then you could try reinstalling your windows operating system. If that doesnt work then I should try running something like Disk Manager from Ontrack. This is on just one floppy. This will perform an Fdisk, re partion and reformat for you in one go. Obviously you will lose all data on the drive by doing this. Afterwards install windows again.
Although it may not sound likely the fault could also lie with your Ram chip.
Could also be a heat problem.

it's not a fujitsu hard drive by any chance is it ??