Green screen on A530 boot up

[Zac67]

The A530 has its own power connector, and I'm fairly sure it's not enough to power the A500 alone. Split up the ATX PSU cables and connect that to the A530.

As to which lines have to connect where: no idea. But it's probably easy to follow the power input lines to the HDD power lead, so you'd know which is 5V and which 12V. The plug looks pretty much like vanilla DIN.

[Zac67]

Have you tried disabling '030, SCSI BOOT ROM & RAM plus disconnecting the drive? If that doesn't work either, there's something electrically wrong with the unit. If it does, slowly and one by one activate the options to pinpoint the problem.