X58A-UD3R r2 Needs several attempts to start

[uDraft]

I’ve been running my X58A-UD3R rev.2 machine, a daily worker, for 2 years or so.
It sleeps each night and wakes each morning with a mouse click.
Just recently, it will not respond, so I push the main power button, the red light flickers and no start.
It simply flickers on, goes off, and will not even flicker again until I flip the PSU switch off for a bit.
After repeated attempts, it eventually starts normal.
I do note some yellow and green lights in the DDR voltage bank when it is dead, these do turn off once the system finally boots.
No software errors are showing up.
Is this simply a case of bad Power Supply? It never misses a beat under use conditions.
I’m sure this is a duplicate post, but I couldn’t find a similar thread.
tia

[Vinster]

Please list a full hardware list and overclock setting if they apply.

if you can also include parts numbers if you are aware of them...

without that info we'll be wasting our time.

Vin

[uDraft]

here's that info

OS~Windows 7 Pro 64-bit SP 1
CPU~Intel(R) Core(TM) i7 CPU 950 @ 3.06GHz
Motherboard~GA-X58A-UD3R (rev. 2.0)
Memory~Mushkin Silverline 12gb (3x4gb) 998770
Graphics Card(s)~PNY VCQ2000-PB Quadro 2000
Sound Card~on board Realtek
Monitor(s) Displays~2x22" Samsung
Screen Resolution~N/A
Hard Drives~1-OCZ Vertex 2 OCZSSD2-2VTXE120G
2- IDE\DiskWDC_WD6000HLHX-01JJPV0
1-IDE\DiskWDC_WD2002FAEX-007BA0
PSU~CORSAIR CMPSU-850TX
Case~COOLER MASTER Storm Scout SGC-2000-KKN1-GP
Cooling~3-120mm case fans
Keyboard~Dell 09C487
Mouse~Logitech MX500
Internet Speed~15/2

[wazza300]

using latest bios? and what qpi/vtt voltage are you using? 12gb will usually need alot

[uDraft]

yes, latest bios, all voltages set to auto

[wazza300]

yes, latest bios, all voltages set to auto

can you see how much auto is using for qpi/vtt? it will be in the bios or look in easytune/tuner/voltage 1

you might need anywhere from 1.35-1.58v qpi/vtt with 12gb,may need even more

[uDraft]

well last time it was running (yesterday) voltage readouts looked fine. Can't get it to power up today.
I've tried several things:
different wall plug
reset bios
checked RAM with memtest
re-seated RAM, vido and power to mb
tried to boot with all power unplugged except mb, c:

When it was running, it was flawless, I may just go pick-up another psu

[wazza300]

it could be psu,if it was running fine before and not now then somethings a miss,i just though it might be unstable due to low qpi/vtt voltage but you said it was running fine before

did you try clearing the cmos? this will reset the bios/oc settings to default

[uDraft]

yes, it has a little button on the back to reset bios.

Now it is acting different, it turns on for a second, then off, then repeats 4 seconds later, continuosly

[wazza300]

try removing the cmos/motherboard battery,leave it out a good 30 minutes and then put in and try

sometimes longer is needed