Which mobo to replace Asus A8N-SLI

Hello everyone.

My system is around 2 years old and has recently stopped POSTing after a few weeks of locking up or throwing BSOD screens.

MB : Asus A8N-SLI Basic NFORCE4
CPU : Athlon64 3500e 512kb cache 939pin
RAM : Patriot 512mb DDR PC3200 x2
Video : EVGA nVidia GeForce 7800 GTX 256MB PCIe
Audio : on board sound
PSU : 650w ATX2.0 24P

I bought the system from Alienware and is out of warranty.

I tried most if not all the steps to diagnose a no POST power up for a system.
And the best guess I have is that the motherboard is fried. The chipset fan has failed and is off center in its housing, hence not spinning. I think this may have been the root cause of the system's failure and subsequent no POST power ups.

My questions are : Should I even endeavor to replace both the motherboard and/or cpu while salvaging the rest of the system?
Which motherboard should I look into purchasing like an Asus A8n32-SLI Deluxe?


I am a little technically inclined and can try it to fix my system myself.

Thank you for taking the time to read this newbie post and the effort of your replies.

Thanks, Monkey, your reply makes a lot of sense. That occurred to me while searching for a new mobo. I guess it is just a matter of how much I am willing to spend. Is there something you yourself can recommend in the neighborhood of $500? mobo cpu and ram of course.