the old green screen A500 thing...

[Tomas]

Have you checked the ram card?? If it had a battery seated, then it might heave leaked onto the card and that can cause some major problems.

[Tomas]

I agree with weirdamy.
even if you cant fix it, then you can probably get use of the spare parts someday, or sell/give it away to someone who does.

But anyway, one last suggestion.. try removing any hardware not needed for testing it, like extra ram, floppy drive, hard drive, tv modulator and so on... see if that makes any difference at all.

And if you have a different psu, then try that aswell.