i have a MSI K9N6GM motherboard with a AMD64 Sempron 3200. was installed into a case. worked fine. hen shut it down one day. will not start up again. when the power button is presse the internal fan and cpu fan spins, bbut no other lights or power. all cables have been tested in other computers, as have the power supply. the powe supply is a basic 250 watt. which is more then enough to power the motherboard, dvd drive and HD. how do i check or find out where the issue with the board could be without taking it to a store? thank you