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Power supply shows good when tested but when connected to the mother board it do

Last response: in Motherboards
November 6, 2010 7:49:18 PM

i have an asrock 4 coredual- vsta board that i installed with igb memory and an intel pentium 4 processor.the power supply is an atx antec 400watt power supply.the board does not power up but when i disconnect from the board itself and connect the tester,the drives run the fans on the power supply run and shows that power is getting to everything except the it (board) dead or is there something else i can try ?

need help


a b V Motherboard
a b ) Power supply
November 6, 2010 8:05:51 PM

Try a new or loaner PSU
Related resources
a c 156 V Motherboard
a c 144 ) Power supply
November 8, 2010 10:20:26 PM

Either the board is dead, the PSU is bad because it cannot support the load of a complete system, or (possible but unlikely) the CPU is defective.
November 9, 2010 3:44:11 AM

thanks for your help,i will check it out
November 9, 2010 4:19:04 AM

just goes to prove that a cheap power supply tester only checks for rails in spec. it does not load the supply. At no load many defective power supplies seem fine; they are defective because they can't support a load.

Troubleshooting is a process of elimination. Try with a known good part one at a time, until you find which part is bad.