Of all the computers I have built this is the first time I have had this problem.
When I push the on button, nothing happens.
This is a new build for my wife, and she's patiently waiting for:
Gigabyte GA-P35-DS3R motherboard
Intel E6750 CPU
2GB G. Skill 6400 memory
MSI NX8600GTS vid card
Seagate SATA2 160GB HDD
500W Cooler Master PSU
The problem is when I try to turn it on, nothing happens.
I checked the PSU with an Antec tester and it seems OK, I even tried another new PSU with the same result.
I noticed, however, as I unplug the ATX connector I get a brief start of the PSU and case fans. I've double checked the ATX (20+4 pin) orientation and pin configuration to no avail.