Dude, why waste your time trying to fix that POS computer? Everyone knows that the best computer is the Amiga 2000. (The great Doom Master even thinks so!) It's a work horse and never has issues like this! 
My A3000T is also not working. I think it has a flakey CPU slot on it. It's just a big hunk of metal right now. Dead as a doornail. I have to open it up every so often and reset the CPU card on it to get it to work. Never have this problem with my Amiga 2000's...
Yes, that CPU slot is a pig. To seat my 060 I had to push so hard I was worried about the motherboard breaking and wow, all those little solder joints are really small deadly pins with that much force
