5400/5500 died when booted against 10.1

I had my OSX 10.1 CD in the drive when I thought it was my OS9 CD and booted against it to refresh my opsystem in two of my old PowerMacs... of course the 5400/5500 can't run OSX, but it actually knocked them out cold right after trying to boot, No happy Mac, no screen lit up. just a single bong, and now I only can get a single bong, no video out of both of them. I am going to try to zap the PRAM, any other suggestions?

Thanks!
DaveP in Ohio
dcpyatt@gmail.com