I just bought a new Power Man 350W switching power supply for my old computer. I bought this PSU because it's not as noisy as the old one (actually it's not really nosy at all compared to the old one--that's why I want to replace it) which is also rated 350W (Power Box).
Now, when I plug all the necessary cables into the motherboard and press the power button, the computer is being completely unresponsive (there is not even an attempt by the CPU to start spinning the fan for a split second) though the small green LED on the motherboard is lit up.
As a test, I even unplugged the hard drive along with the CPU fan in the hope that it would lower the overall load on the PSU. The same thing. The computer just won't start.
But when I plug the old one back in, everything is working just fine. The new PSU appeasers to be working fine using the paper clip method. So, it's not broken or anything like that.
So, that's my problem and I don't know what I really should do in this situation. Any help is welcome and highly appreciated.