I went to my computer a few hours ago and it was off and wouldn't turn on.

I took out the motherboard cable and shorted green to black and nothing happened. This leads me to assume that the power supply is dead.

I haven't built a computer in two and a half years. What are the good power supplies brands right now? The PSU was an Antec 550W TPII-550.

so, a ~600W would be good.

Thanks in advanced.