Asus P4B266-C Boot Problem - Won't Scan Boot Devices

Hey all!  This is kind of urgent as it's for a client of mine so I hope someone knows the answer.  He has an Asus P4B266-C with a P4 1.8Ghz and 512MB DDR266.  The system has been working fine for quite some time, but recently developed a problem.  The system goes through the POST procedure fine and gets to dispalying PCI devices.  However, the system halts there.  It doesn't start seeking boot devices though the floppy light remains on from the seek the BIOS does.  This just starting for my client suddenly two weeks ago.  Yesterday, I resolved the problem by clearing the BIOS and redoing the settings.  I also flashed the BIOS from 1002 to 1006.  It worked for a day and now it has started doing it again.  Has anyone seen this before and does anyone know what causes it or how to fix it?  When his system boots, it runs fine with no instability whatsoever.  However, now it isn't booting at all.  Can anyone help me out?!  Thanks all!
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My first impression is there there is a problem with the hard drive.  Try swapping out the drive and see if this problem goes with the drive.
PXAbstractionAuthor Commented:
I had considered that as well, but why then would clearing out the BIOS settings eliminate the problem temporarily?  It also doesn't reach the hard drive in the boot cycle before freezing.  It's supposed to cycle through the floppy and the CD-ROM first and you can put bootable media in both drives and it will freeze before checking either one of them.  I will try and new drive though and see what happens.  Any other ideas out there?
have you tried just removing the floppy and the cd-drive and seeing if it boots from the hd?

disconnect all and add one by one to see if one is causing the trouble

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PXAbstractionAuthor Commented:
Unfortunately, that didn't do the trick either.  Two days after my initial visit, my client had a bunch of folders randomly disappear form hsi system and now his GoBack (blech) driver is corrupt and won't let him into Windows.  I ran PowerMax on the hard disk and it passed with flying colours.  He also has up-to-the-minute anti-virus so I doubt a virus is the culprit.  I'm thinking more that his disk controller is toast and that it may be time for a new mainboard.  Anyone else agree?
do you have a pci ide controller to try?

PXAbstractionAuthor Commented:
Well, last night I restored his MBR which kicked out GoBack and gave him the ability to get back into Windows XP.  It seems the rest of his data is OK.  After backing up his data, I ran a Defrag and several high disk-intensive tasks and now the system doesn't appear to have any issues at all.  He suffered no data loss or corruption whatsoever in several hours of testing, and this was on his mainboard controller.  Has anyone heard of cases where GoBack can suddenly just corrupt itself so that it doesn't start?  I'm not a fan of that program, but I must admit that I've never heard of it doing this type of thing.
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