I bought a new comp, the cooling and case stunk so i switched it too a new case with better cooling (a better fan heatsink and extra sys fan) i have a 1.4 ghz athlon with an K7S5A motherboard GeForce 3 etc.

what are some of the things i could check or do too get it too work?

could it be a bad Power supply unit? how do I test my componenets?motherboard?Powersupply?