A screen that says diskette drive 0 seek failure keeps appearing. Hoow to i start windows normally and get rid of this screen? It is vey simple.Restart the Computer and kepp tapping F2 key and go to setup screen.under setup screen you see an option 'Diskette Drive A' or 'Floppy Drive' highlight it and it will say 1.44' or 3 and half inch. Press space bar and turn. Dell Optiplex 755 boot errors So I bought a refurbished Dell Optiplex 755 about a week ago running Windows 10 Pro 32-bit and it worked fine. But now after disassembling the PC to upgrade the CPU and give the case a new paint-job, it refuses to boot.

Your keyboard must work.
Make sure it's plugged in all the way.

Dell Optiplex 755 Floppy Diskette Seek Failure User

- BEFORE you boot the computer if it's PS/2 connected.

Dell Optiplex 755 Memory

Corded keyboards often develop broken wires inside the cable after they have been used a lot, or at any time if the cord was yanked on. Try another keyboard.
There is no setting that would disable a PS/2 connected keyboard in most bioses, but some computer cases have a keyboard lock switch, often a chrome one that uses a round tubular key, on the outside of the case that can disable the keyboard (if there is no switch, the keyboard is always enabled).
A corded USB connected keyboard should work while booting, but a setting in the bios Legacy USB or USB keyboard must be enabled in the bios Setup in order for you to be able to get into the bios Setup. If that's not enabled, you can connect a PS/2 keyboard, go into the bios, and enable that setting. Older bioses like yours often have that setting disabled by default; newer bioses usually have that setting enabled by default.

Tech support OptiPlex™ GX110
http://support.dell.com/support/top...

Dell Optiplex 755 Memory Max

Dell Optiplex 755 Desktop Pc

Manuals OptiPlex™ GX110
http://support.dell.com/support/edo...