New system won't turn on

[RobertM525]

I just built myself a new system with the following parts from Newegg.com...

GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX Intel Motherboard - Retail
Intel Core 2 Duo E7300 Wolfdale 2.66GHz LGA 775 Dual-Core Processor Model BX80571E7300 - Retail
SAMSUNG 22X DVD Burner Black SATA Model SH-S223F - OEM
COOLER MASTER Centurion 5 CAC-T05-UW Black Aluminum Bezel , SECC Chassis ATX Mid Tower Computer Case - Retail
EVGA 512-P3-N861-TR GeForce 9600 GT 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
CORSAIR CMPSU-450VX 450W ATX12V V2.2 80 PLUS Certified Active PFC Power Supply - Retail
Kingston ValueRAM 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model KVR800D2N5K2/2G - Retail
Microsoft Windows Vista Home Premium SP1 32-bit English 1pk for System Builders DSP OEI DVD - OEM
Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

...and after plugging everything in, I found that it won't turn on.

At first, I thought it could be the power button on the case, so I wired my new case to the motherboard on my old computer (the one I'm using now). The system turned on just fine (though I only had it on for a second before shutting it off).

After that, dismayed that it wasn't just the power button, I tried plugging the power supply from my old computer (same model of PSU) into the motherboard on my new computer to see if I could get it to turn on. Now, maybe I did something wrong, but when I pressed the power button on the new computer... nothing happened.

Any suggestions? Could it be that my motherboard is shot? Is there still a chance it's somehow the new power supply?

Thanks!

 

[GhislainG]

Nothing at all? Fans don't spin, even for a couple seconds? What motherboard is in your old system?

 

[RobertM525]

Nothing at all? Fans don't spin, even for a couple seconds? What motherboard is in your old system?

When I press the power button on my new system, absolutely nothing happens. It may as well be unplugged for all the effect it has.

My "old" system isn't really old at all. It's has a GIGABYTE GA-MA770-S3 AM2+/AM2 AMD 770 ATX AMD Motherboard. (I bought it in April so that I could give this AMD-powered system to my wife when my Intel system was built.) Oddly, it only uses one of the little four-socket power do-hickies (in addition to the big one) while my new motherboard uses two of them. Well, okay, maybe that's not odd, but I thought it was interesting.

At some point, when I'm feeling less frustrated and irritated (and don't have a movie to go to with my wife in twenty minutes), I plan on trying to connect the new power supply to my old system it see if it does anything.