After installing my Pro Tools|HD cards (HD Core and HD Process), my computer...

After installing my Pro Tools|HD cards (HD Core and HD Process), my computer (G4 AGP 933MHz) refuses to boot. The power light goes on but nothing else (no Mac chime or monitor activity)

In two cases, resetting the motherboard solved this problem.
The button to reset the motherboard is located near the battery. Hold it down for at least 5 seconds to perform a complete reset.

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