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[G4 MDD Steve]

Hello, I've just dug out of storage and attempting to resurrect a 2003 MDD 1.25 single processor G4.

I've bought new RAM (2x 512Mb), a new clock battery, reused an old 640Gb iMac HD with an adapter card. The monitor is connected with a DVI to DP cable. When I turn it on I hear the chime, which suggest the motherboard is OK, but the monitor does not detect an input signal, so I see nothing. I was expecting the flashing question mark for no OS present.

Is there a fault-finding sequence I could follow to narrow down the problem? I know the monitor is OK because I used it on my Raspberry Pi, which I just sold. So, to me, that suggests the video card or the cable, which is brand new. The card is the 64Mb version

Any help appreciated.
Steve