amiga 2000 boot up: random colors and that's all

[pioneer]

This could possibly be caused by corrupted software which is overwriting the chip ram area. Do you have a clear screen during any part of the boot process? Is there a specific point where the screen becomes garbled? Have you tried booting from a floppy? If you have, try booting from a different floppy. Before you can blame hardware as the cause, you have to eliminate software causes. Do you have any fast ram or is it all chip ram?

[pioneer]

The entire screen changes color three or four times during boot. Another thing a novice can check without damaging things. Expansion and contraction when the computer heats up after being turned on and then cools off when it's turned off can cause socketed chips to work loose. This is especially true of such an old computer since it's been going on such a long time. If you firmly push down on a socketed chip and you hear a click or pop, that means it's worked up a little. Of course you have to watch out for static charge whenever you work inside a computer. Pushing down all the socketted chips might help. I reseated all the socketed chips in a Commodore 64 and it solved some problems it was having.