I have worked on many many PCs since Apple II clones in 1981. It really is
hard to kill a system just removing a card. Not impossible, just real hard.
I have killed systems dropping a screw into the case, putting the AT
motherboard power cables on backward, 486 CPU in the socket rotated 90
degrees (ceramic melting like a sinkhole at the pin that fried, real neat),
bad bios flash, etc. All had a reason (my tiredness and stupidity most of
the time). I honestly don't think I knowingly killed a card or system with
static electricity but I probably did and it just tested bad and was
replaced. Static problems are impossible to prove after the fact but it
must definitely happen. Don't get me wrong, static is an issue, no question
of it. But people make a bigger issue of it and use it as a catch-all
excuse when things go wrong.
Most times when you have a problem it is because you are tired or did
something simple that was wrong. You made a simple change so I would assume
it to be a simple problem. Come back to it in a couple of days if you have
the patience.
I guess you will have to test each component in another PC proving each one
is good if you have another PC to use. If not do the minimal system
technique. Disconnect everything except the video and power it on. If it
works, rebuild it piece by piece. If not, consider removing the motherboard
and reseating it. Rebuild from scratch.
I don't know how many times over the years I have breadboarded tested a
system on the bench, then put it in a case to find it does not work. Take
it out, put it back in, redo all the cables and it works. Biggest problem I
have found it floppy and IDE cables, then CPU and RAM. They just aren't
seated properly, redoing them fixes the problem. But in your case, all you
did was remove a card. Don't know, you may have jiggled something loose
like an IDE cable. Or put it on backward ???
Good luck
)