GA-MA790GP-UD4H + Phenom 550 won't post

[Guest]

Hi there. This is my current config:

MA790GP-UD4H
Athlon 64x2 5200+ (65nm brisbane)
2gb ddr2 800 A-Data
XFX HD4870
LC-Power Hyperion 700w

I wanted to upgrade my cpu, so i got a Phenom 550 (rev. c2)

After installation, it didn't post: no beep, no display, fans&hdd spinning.
So i took everything out from the case, unplugged everything, did a CMOS reset (left the battery our for an hour to be sure), and it still won't boot.
I did anything: only one stick of ram in each slot, integrated video card, various bios version (if i use my old 5200+ everything works fine), cmos resets, but nothing seems to work.
Weird fact: if i use phenom's box cooler, its fan will always spin. If I use my AC Freezer, fan will spin a little when i turn computer on, then stop, and spin a little again when i turn it off (I have to use the psu interruptor to do so).

 

[shortstuff_mt]

Have you updated the BIOS to the latest version?

http://www.gigabyte.us/Support/Motherboard/BIOS_Model.aspx?ProductID=3004&ver=#anchor_os

 

[Guest]

Yep, I did, I updated to various version, and none of them changed anything.

 

[bilbat]

Sound suspiciously like a dead CPU to me - do you have a buddy with an AMD-based system who could 'toss it in' to check for you?

 

[Guest]

Yeah, I'm starting to believe it's a faulty cpu. If I can i'll try it on another rig, otherwise I'll get it directly back to the shop. I just wanted to be sure that i tried everything that could be done. Thanks