Trying to change jumper settings-Whole computer no longer works

I had a computer where 98 was installed on a small hard drive, and was
using the bigger hard drive for files. I had to reinstall 98, and
decided to move everything to the bigger hard drive. I backed up my
files, then opened up the computer, disconnected the power and data
cable from the small hard drive, and changed the jumper settings on the
big hard drive to what the sticker on the hard drive said was "Master."
I plugged the computer in, it booted on it's own, but nothing, not
even an error message came up on the screen. I tried not havingn a
jumper in the hard drive, replacing the video card, replacing the old
settings, but nothing works. I tried not to touch anything else in the
computer, although some plires got a little ways down the heat sink,
but I stopped them before they touched the processer. I was not
grounded, but did not feel any static electricty. It seems weird that
not even the BIOS will come up. Did I breaky my (Old) comptuer
somehow, or is there a fix?