K9N2 Diamond refuses to P.O.S.T...

Question

Greetings,
I'm in a bit of a predicament and was wondering if anybody has some ideas as to the solution to the problem I am about to present.
Let me start with a little background:
I built this system around 2 years ago and haven't had many problems with it. I've reformatted numerous times, the most recent being last month. About a week or two ago
I tried to play a .wmv file via Windows Media Player. My system hung during program execution and I was forced to manually power off my computer (in other words, I held
the power button for five seconds). When I powered the system back on it failed to P.O.S.T.
Now, during a normal start-up a number of things happen:
A.) The computer powers on, fans start whurring, lights from the K9N2's on-board LED's will flash between green and red (this is important), and finally power is fed to my I/O devices.
B.) The mainboard then beeps (I cannot remember the beep pattern), all the on-board LED's are green, my display shows my BIO's screen, and the system then continues it operations before loading the Operating System.
C.) Windows is then loaded and I have an operational computer. Hurray.
Here is what happens as of now:
A.) The computer powers on, fans star whurring, lights from the K9N2'S on-board LED's will flash for what appears to be two cycles (basically the LED's go through two patterns) and then I hear a long beep followed by two short beeps. (Beeeeeeepp.... Beep. Beep.) The LED pattern stays as follows: RED, RED, RED, GREEN.
No power is fed to my I/O devices and I receive no display. The computer basically hangs. One thing I feel I should mention is that I was able to get the computer to start again by clearing the CMOS but this strategy will not work anymore. Note: this process involved restarting the computer countless times, clearing the CMOS, starting the computer and seeing if it would P.O.S.T, if it did not, I repeated the process. It was not as if I simply cleared the CMOS and the computer worked instantly. I had to do it several times.
Now it seems no matter what I do the system refuses to P.O.S.T. My computer specs are listed at the bottom of this thread. If you felt something was not clear or you feel you need more information, please let me know and I will be glad to explain. I look forward to working with anyone who is willing to help me tackle this problem.
Take care,
pr3ddd
COMPUTER SPECS:
-MSI K9N2 DIAMOND AM2+/AM2 NVIDIA NFORCE 780A SLI ATX MAINBOARD
-ABS TAGAN BZ SERIES 900W PSU
-AMD ATHLON 64 X2 6400+ @3.2GHZ PROCESSOR
-4GB OF CORSAIR DOMINATOR DDR2 1066 RAM
-NVIDIA 9800GX2 DUAL-GPU GRAPHICS CARD
-SEAGATE BARRACUDA 500GB 7200RPM SATA HDD
-CREATIVE SOUND BLASTER X-FI ELITE PRO SOUND CARD
-MICROSOFT'S WINDOWS X64 PROFESSIONAL

Answer 1

So.... Problem solved. Looks like it was the graphics card. When I got the almost normal boot I realized that the only reason I had: GREEN, RED, GREEN, GREEN LED's was because the system was waiting for me to load the default values for the CMOS but since I didn't have any display I couldn't see that. So I replaced my HDMI cable with a VGA cable and the system reverted to the previous RED, RED, RED, GREEN state. At that point, I took out the graphics card, used the onboard video and wa-la. Thank you Mike. I'd have never thought to reseat the graphics card. Looks like no games for a while... Oh well.