Video card not working?

[technossomy]

I was doing diagnostics on my 3GB Seagate harddrive, reinserted the cable and fastened the HDD. When I then switched on the computer - which has a Linux Ubuntu distribution installed on it, but is currently booting from floppy diskette only - it would not light up my monitor: neither a Compaq V55, nor an Acer AL 1417 will show the boot page. I can enter commands from keyboard, because I can hear the HDD and floppy react, but not see anything. How do I fix this problem, which happened so unexpectedly?

Thanks in advance


Tech

[ski]

Reseat the video card making sure it's fully seated.

If no luck, then clean off its contacts with alcohol.

If still no good, then try a different known working video card. If it works, then yours is bad.
If it does not work, then the video card's slot may be bad. If it's a PCI video card, then try it in a different slot.

[technossomy]

Thx ski, I'll try that.