Few questions:
When you switched the machine on did the power light flash ?
If you have a hard drive was there any hard drive light activity? Any.
Again if hard drive was the light on all the time for a while ?
Did the keyboard caps light flash on and off constantly ?
The screen monitor, was the image static or did it flash differing shades ?
When you pushed in the floppy was there any drive activity ?
Have you left the machine running for a long time and if so does the power light begin to flash, or stop flashing and stay on constant say. And if the screen is flashing after a while does it stop flashing.
I have an A2000HD with a mind of its own and its a bit like my old Austin A35 in that it wants a little TLC in booting. I always fix my computers by taking very tiny steps and just dealing with one thing at a time. Doing anything drastic could very well create more issues sadly. All is not lost though. A2000s are very hardy.
