Apollo 1240 Black screen :(

[dougal]

My A1200 was working fine.

Today i installed my scanmagic and it worked fine and then froze.

Now it either wont boot or else very few times boot and then freeze.

When i remove the accelerator it works fine.

WHat could be wrong? A1200 with Apollo 1240 powered with an A500 PSU.

I tried another PSU from an A600 (i dont have another A500 one) but it still refuses to work.

I tried reseating the ram on the accelerator and tried booting with no fastram.

[dougal]

I also tried removing the DCE scanmagic but still no go.

[Dazxy2001]

Have you tried booting it with the hard drive disconnected and checking to see if the board shows up in early startup ? It could be that the A500 supply you have been using is giving up as the 040 draws a fair bit.
I had the same board but at 25mhz and when my Goliath power supply went belly up I tried an A500 power supply but it was a no go with everything plugged in.