No POST No Beeps

This is my build (about 26 months ago)

MOBO: Asus M5A88-V EVO 880G RT
CPU: AMD FX-6100
HD: Seagate 1.5T /ST ST1500DL003
MEMORY: 2X2G KINGSTON KHX1600C9AD3K2/4G RT
VIDEO: USING INTEGRATED ON MOBO
PSU: ANTEC EA 650N GREEN 650W 80 PLUS BRONZE
CD/DVD 1:ASUS (no model no.)
CD/DVD 2:SONY (no model no.)
CASE: ANTEC 300
MOUSE: MICROSOFT
KBD:KENSINGTON
EXPANSIION SLOTS USED: NONE

Please note, this build ran perfectly for about 26 months from the moment I first did a power on, until 2-3 days ago. This is NOT a new build.

While running a ham radio program I have used for 9-12 mo., the screen froze, the mouse cursor disappeared, there was no response from mouse movement or keyboard. Reset and front panel power off were unresponsive, so I switched the PSU off. Since then, all boot attempts have failed with no boot beeps.Yes the mobo speaker is connected and working. Power on spins all fans, panel and mobo LEDs are lit and HDD & DVD drives seem to spin up. The front panel power button works normally both for power on and power off. The front panel reset button dims the HDD LED briefly, then the LED returns to steady on.There is no flicker. Things I have tied:

1 .Followed the suggested no boot procedure, but did NOT remove the mobo for' bread-board' setup.(recall all was well until the screen freeze).
2.Checked all PSU voltages while under load (i.e. PSU connected to the mobo).
3.Tried known good monitor.
4. Disconnected everything except mobo, CPU, CPU fan and PSU.
5. After about 30-45 min of power on, shut down, removed CPU heatsink and touched CPU; it was warm.
5. Disconnected everything except PSU and mobo.
6 .Inspected mobo and case for signs of debris, overheating and burn evidence. Nothing seen.

Tried to boot under each of the above conditions with the same result: no boot, no video and no speaker beeps. I don't have spare CPU or mobo to do part swaps in order to identify the failure (pretty sure it;s mobo or CPU). Duno which to go out and buy!

With CPU removed, and if the mobo is good, shouldn't the mono generate beeps to indicate a CPU failure as part of POST? That makes me think mobo failure.

Any ideas?

Well against the odds, but with a few minor suggestive symptoms (e.g. this mobo appears to need a good working CPU to generate POST beeps), I bought a new CPU (AMD FX-4130) to replace my suspected bad FX-6100. Wala .... I get a POST, beeps and BIOS video! That;s the good news. Bad news is this.

My build refuses to successfully start W7. Attempts to start W7 ask to repair bad W7 files. I accepted the repair and W7attempted the repair(s) that include an array of tests. All the tests pass, but W7 says the repair failed and ....... 'that is all'.

Anyone know why replacing a bad FX-6100 with a (new) FX-4130 (in the same mobo) would cause a W7 start up failure?

A second question: during POST, the red mobo's DRAM LED lights briefly, then turns off and remains off. I never had a reason to notice this. Is this normal and just part of the POST?