Can't write to floppy

This machine won't write to floppy or when it does it writes bad data. It sometimes wants to format a performatted disk. After you try to format it you get a damaged disk or write protected error. It reads disks from other machines
 Have changed the drive, I/O card, and ribbon cable. Tried different slots on motherboard, added memory, upgraded video card, all to no avail.
 This pc is 100mhz pentium, Award bios, 48 meg, sb16, ati video, teac cd, Iomega zip drive(scsi), printer is an HP Office Jet 1150c. Win95 (non ors2), use nav,  main apps used are Office97 and Quick books Pro. I recently did a low level format and reinstalled everything from scratch. It seemed better but for a while but still is not right. 95 doesn't see any conflicts.
 
red10Asked:
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MattiConnect With a Mentor Commented:
Does your mainbord have a flash BIOS, then it is possible to chance the bios contents.
The Bios may hold damaged data.

Check the mannufacture page if there is bios update.

I have seen such motherboards before, and they may also
cause destruction of IDE harddisk or randomwrites to disk.

Such virus are possible today.

Matti!
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red10Author Commented:
Edited text of question
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vikiingCommented:
Perhaps this answer seems too stupid, but ¿don't have you confused drives A: & B: values at BIOS?; I mean, ¿is it possible you have a 3 1/2 drive, and BIOS setting (wrongly) specifies 5 1/4 parameters?

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OttaCommented:
> Have changed the drive, I/O card, and ribbon cable.

Have you changed the media,
i.e., purchased some new certified-for-1.44MB diskettes?
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red10Author Commented:
Sorry for the delay in getting back to you, but business took me out of town for a while.
This PC does have a flash bios. I will investigate further. Maybe I can re-flash the prom
or just buy a new one. Thanks for the suggestion.
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