All four HDs are 5V 0.74A. Couldn't find the info for my PCI IDE card, but googled 5V 0.15A for a similar looking one.

Thanks for the explanation. I was able to reproduce the problem, and indeed it's gone once I removed the two IDE drives. They are relatively small, so it's not a terrible loss.

I've had my system running couple of days now with the 120W converter from electrodacus. Intel Atom D525MWV 1GB RAM 2x SATA HD 7200rpm 2x IDE HD 7200rpm PCI -> IDE card 12V 0.2A fan 20V 4.5A laptop power brick Too much for the brick? Today the system shut down abruptly (while installing windows unde...