Desperately needing help, possible psu/mobo issue disabling all gpu activity

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SyntheticSoul

K another broken comp thing, but found excellent help here before so thought id try before buying replacement parts:(

Got a 8800gt 512 "GS" and a 400w PSU to replace a 7600gt and 300w PSU.
after replacing both the monitors fail to get a signal and drives dont boot.
the mouse and keyboard also only light for about a sec.
The 8800 needs 450w min though..*****ic me. so replaced again with originals,
but the problem remains,HDDs,monitors and keyboard all work fine on other machines.
tried both cards,both PSUs,both pci-e ports,both pci-e power connections,different monitor and hdd.totally stuck right now and desperately need it working at the moment.

any help or advice from the superior knowledge here would be extremely appreciated, thanks

PSUs are Fortron 300W +12v=16a / NorthQ 400W +12v=18a ..i think
 
Neither of your power supplies have enough amperage to feed the 8800 GT. You need at 450 watts with at least 30 amps combined in the 12 volt section. Go a little over that if you can to be sure other devices have enough. This will fix this issue.
 
Yeps that problems being fixed.. theres a 600w 72 combined amp on the way,
Just wondering why the old card wont work either.. could the 8800 have fried the mobo?
 
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