No boot no post no beeps, help

[Mod1Fy]

Hardware.

Intel Core 2 duo
Gigabyte p35-ds3l
2 gb crucial ballistix
geforce 8800gt
2 Hdds
1 DVDRW
antec sonata 3 w/500W earthwatts PSU
win XP

I have had this setup for over a year now and it has been working fine, there have been no symptoms leading up to my problem.

Computer froze, and on reboot would not POST, with no error codes.

Fans spin up, but no signal to the monitor,
Normally at boot GPU fan revs up to highspeed momentarily than ramps back down, but now it revs up and stays up, reset button does nothing have to hold power button.
PSU fan is not spinning during boot up but I am not sure if this fan is heat activated or not.

I have unplugged all non-essential devices leaving just RAM, CPU, GPU.
still no joy.

The last thing I have done is remove both RAM modules, at this point I do get either 3 beeps, then reboot and continuous.
Or I just get continuos beeps.
And the GPU fan does ramp down.

I have tried both Ram modules in all possible configurations to rule out Ram slots, always no beep codes with Ram plugged in.

So this leads me to believe it is either the PSU, or RAM is there any test I can try to tell which one, short of swapping as I have no spare parts handy.

 

[Mod1Fy]

update.

Used multimeter on 4 pin molex connector, and 5v and 12v rails are fine.
Tested Aux connector and 3.3v, 5v, and 12v connectors are also fine.

Is there any way to test the voltage running to my Ram slots?

 

[Tedster]

is your ram of the correct recommended brands and types?

is your cpu getting power?

 

[Lardy1664]

Tedster .I'm guessing the memory is the right type for the mobo as the system has been working for a year plus. !!!

Is the monitor working?
Can you get to the BIOS by tapping del key or F1 key or F2 key as it powers up.
Do you get any hard drive action indicated on the led as it powers up?

 

[Mod1Fy]

No BIOS access, no HD acess, yes CPU is powered.

I was able to swap my RAM with a buddy and viola it worked.

My question is could there be an underlying problem that could cause
both RAM modules to go bad at the same time?

 

[kimsland]

Yes dust in the ram channels even the PowerSupply under load (even though you get the correct voltages, under load it may change)
Or faulty CPU or cooling

Therefore try, removing all connected internals and blow out all dust with high compressed air
Reseat the CPU and apply new thermal paste
Replace the PowerSupply and test with that
Or this just could have been faulty Ram

By the way all that I've mentioned here is in this guide: Tutorial: No POST (Power On Self Test