Just finished a new build and have a problem. CPU?

I just finished a build and everything is powering up (fans running, harddrive spinning, light on cd drive) and seems to be working. I have it plugged into a monitor via DVI using onboard video (no video card installed) and the screen is completely blank, no post, no beep. The IDE Samsung DVD/CD combo drive lights up indicating power, but will not open.

Here are the specs of the computer:

Processor = AMD Phenom 9950 2.6GHz Socket AM2+ 140W Quad-Core

Mobo = Asus M3N78-VM (AMD AM2+ Quad-Core CPU/AM2 CPU Support)

RAM = Kingston HyperX 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel

Hard drive = Seagate Barracuda 1TB SATA

Power Supply = Cooler Master eXtreme Power Plus 500W ATX12V V2.3 Active PFC

Here's what I've eliminated so far:

- Not the motherboard. Originally tried this with a M3A78-VM and had these problems, decided to try a new mobo and decided to keep the M3N78-VM. Both mobos had same problem.
- Not the RAM. Tried the Kingston as well as some Corsair.
- Not the monitor. Tried two different monitors.
- Not hard drive or DVD/CD drive, worked in other computer.
- Tried resetting CMOS but saw no changes.

So I think it's pretty clear it's got to be the CPU. I started it up and let it run for about an hour and using an IR Thermometer, there wasn't any temperature change around the CPU/Heatsink.

Even though it really has to be the CPU, I haven't seen any reviews of a dud Phenom 9950 from the get-go and want to make sure there isn't something else I'm missing before I send it back for another, especially since I bought it from NewEgg and it'd take a few days to get a new one.

I've built computers before, so I'm not clueless, but is there anything that I might have missed (not plugged in or something) that would cause any problems with the CPU like this? Ask me questions, even if they seem really obvious to you, I won't be offended. It's always something glaringly obvious and stupid that causes a problem, so help me find it! It fits in the mobo fine, I aligned the golden triangle on the cpu with the triangle on the mobo, used the Heatsink that came with the cpu with their thermal compound, snapped everything into place, and plugged in the cpu fan. That's pretty much everything I did related to the CPU. I don't think it's an electrostatic issue either, I was pretty paranoid and tried to stay grounded by touching the power supply case every time I touched a component.

So, what do you think? Any ideas?
5 answers Last reply
More about just finished build problem
  1. Plugged all the power cables into the motherboard? Made sure some of the stand-offs in the case aren't touching the motherboard where it's not supposed to?
  2. Did you plug in the 4/8 pin cpu power?
  3. Onboard graphic problem? Try putting a graphic card.
  4. If you hear beep codes on start up, it's probably the onboard video. If you aren't hearing beep codes, you probably aren't POSTing. Which means you probably don't have something plugged in right (cpu power).
  5. +1 to the CPU power connector. Those seem to get missed all the time. The 4-pin CPU power connector on that board is to the upper-left of the CPU socket as the board sits in the case. The 4-pin CPU power connector needs to be plugged in as well as the main 24-pin motherboard power connector. That would also seem to explain why the CPU wasn't heating up at all. :)
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