Wrongly spliced monitor/vga cable damaged video card?

I'm wondering if it's possible for a wrongly spliced vga cable attached to a CRT to somehow mess up an onboard video card? I'll try to sum up the situation briefly.

-Monitor cable was messed up, frayed on end near connector, missing a pin, etc
-So either no picture was displaying, or random colors after wiggle, ie all blue tint or all green or all red or whatever
-Decided to splice cable from VGA monitor with another VGA cable (male/male the kind that you can connect from LCD to video card)
-Didn't have a multimeter so just spliced the RGB wires first with only electrical tape, and plugged it in.
-No picture so started connecting other colored wires and sort of did some random testing while plugged in (just touching the stripped wires, hoping for picture of some sort), (again no multimeter)
-Gave up for a little while because it was becoming tedious.(no wire strippers, was using a knife)

I have another LCD that I'm using on another computer, so I tried plugging that one into the computer I had been doing the work on, and it didn't work at all. Just told me no signal. So I'm wondering if all that testing I did might have somhow damaged the onboard video card on the first computer?

It shouldnt have done at all. The connections in the VGA cable, including the ground and power are outgoing from the PC. Also the power is so minimal it shouldnt damage a card whatsoever.

However, ive never tried it, so I wouldnt know if accidentally crossing over a ground and power could feedback and harm the card, but I wouldnt presume so.