Hum,
assuming that video signal out is working..
The computer goes through a list of `selfchecks` during the 'boot':
1. It clears old data in RAM
2. Disable DMA and interrupts
3. Clear the screen
4. Check hardware (ie, is the 680x0 working?)
5. [color=000099]Change screen color indicating pass/fail[/color]...
6. Perform checksum test of all ROMs
7. Change screen color indicating pass/fail
Looks like it happens before the Change screen color ...
