DiagROM (Amiga 500)

2min

If you swap the Kickstart ROM for a DiagROM chip you can run the diagnostics programs.
Insert the diagnostics ROM into the BIOS ROM slot. 
When first turned on you should have a dark grey, then flashing green, then horizontal multicolored lines, followed by a brief light green then white screen before the final diagnostics screen appears.
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Minimum Boot (Amiga 500)
In order for the DiagROM to be able to control the screen, it needs to have the following chips working and traces good:
68k
Agnus (to see video out, optionally connect to UART output)
Gary
Data path logic ICs
Good clocks
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