Wow blakespot... I thought I had some bad luck... :eek:
450Watts is more than enough. I don't know what the connector type is going to you motherboard, as when I built my tower I cut the end off an old A1200 power supply and wired it to the appropriate wires from the PSU. That way I can use the proper power input on the back of the A1200 MoBo and its also handy for when I have to test any other A1200 MoBo's.
If there is something blown on the mobo, there's now way I can even have a guess at it what might be, without checking it out with my meters & logic probes.
Anway you can check the mobo power connector from the board to the input pins with a meter, there might just be a broken wire or dry joint, especially with all the unpluging and repluging you have been doing.
Cheers :drink:
Franko