I have a IIsi with a fresh battery. The machine was known to have a stable OS on an 80MB drive. When powered on, non ping, just a fan, hard drive spinnning (but not the scratchy 'hey-I-am-reading-something' noise, and the screen shows a solid pale rose color. When a floppy is inserted, no autoeject or reading occurs. It is like the machine just does not want to start. No funny smells from the board that I can sniff.
What diagnostics can I perform? This was a reliable machine for a long time and I would like to save it if I can.