Just came home, (GF pissed), (ehhhmm, not nice) and noticed a suspicious absence of noise, in the corner where my X64-CUDA host is resided . . . . . . dead.
Looks like the PSU is (half/partially) dead, or the MoBo :( .
Would be too early, this host has ran 2 years non-stop 1.5years with 20% OC (X9650@3.6GHz;9x410), last 6 month, with a second G92 GPU's (9800GTX+ & GTS250).Have a look later, gonna have some sleep or whatever.
Not the MoBo, pretty, pretty, please.

[ADDED]I live in the center of a little city, 100 meters from a [i]main-transformer (10KV/3x 230/395), sometimes voltage is even 233V. Forgot the date, when whole Europe, should have 240V (3x240/~400V), instead of the usual 220V.
One year, 2V upped, next year 3Volt's, then 2V., again. So electric equipment can be slowly adapted . Computer PSU's can handle a voltage range of +/-10%.
Only ordinairy lightbulb's can't handle more then 2%, halogen too.
Oh boy, I can sleep 1 hour . . .

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Looks like one of those situations where, unless you have a multi-meter, you'll only find out what is amiss, by replacing a possibly defective item with a known good one. On the power supply (mains voltage) front, quite some years ago, I can remember that 'dual voltage' Japanese power supplies for various things, were rated at a voltage input of 117v/234v....seems a sensible datum, to me. Don't forget that if something is rated for 240v a.c. input, thats the RMS value, which is, if I remember correctly, about 340v peak-to-peak. I don't think I'd worry too much about the voltages received by the various components - voltage regulators on the main board and within the PSU, are capable of keeping things very tight indeed, and some of these regulators have a very wide range of input voltage; by design, they have to. Perhaps your 'dead' or badly wounded PC, could be suffering from a CPU failure....

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Don't take life too seriously, as you'll never come out of it alive!

Do you have a spare PSU you can sub into the rig for testing?

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

Something like one of these might come in handy ....
http://www.newegg.com/product/productlist.aspx?submit=ene&depa=0&description=power+supply+tester

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*Comes from the shadows*

I would peg the PSU is dying or dead. My personal experience is on notion if you haven't touch the the rest of the guts in the 6 months might be the easier fix. Sound very similar to my CUDA based machine last summer.

OTOH...

When you open the case and hit the power and or PSU switch button, do the fans (attached to the Mobo) twitch or just dead?

Try resetting the BIOS CMOS jumper switch for starters, I've been there with my own systems and troubleshooting few others in the past. If it works insert a *yippie!* here. Reapply the OCin'

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Something like one of these might come in handy ....
http://www.newegg.com/product/productlist.aspx?submit=ene&depa=0&description=power+supply+tester

One would have to do some additional research to verify if any of these testers supply a proper load for testing a particular PSU...
Some may not realize that most PSU's do have a MINIMUM load for proper operation and voltage regulation.
If they are not loaded with that minimum power draw, any voltage measurements taken would be invalid.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

Just came home, (GF pissed), (ehhhmm, not nice) and noticed a suspicious absence of noise, in the corner where my X64-CUDA host is resided . . . . . . dead.
Looks like the PSU is (half/partially) dead, or the MoBo :( .
Would be too early, this host has ran 2 years non-stop 1.5years with 20% OC (X9650@3.6GHz;9x410), last 6 month, with a second G92 GPU's (9800GTX+ & GTS250).Have a look later, gonna have some sleep or whatever.
Not the MoBo, pretty, pretty, please.

[ADDED]I live in the center of a little city, 100 meters from a [i]main-transformer (10KV/3x 230/395), sometimes voltage is even 233V. Forgot the date, when whole Europe, should have 240V (3x240/~400V), instead of the usual 220V.
One year, 2V upped, next year 3Volt's, then 2V., again. So electric equipment can be slowly adapted . Computer PSU's can handle a voltage range of +/-10%.
Only ordinairy lightbulb's can't handle more then 2%, halogen too.
Oh boy, I can sleep 1 hour . . .

How many watt power supply, what brand?

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Official Abuser of Boinc Buttons...
And no good credit hound!

[ADDED]I live in the center of a little city, 100 meters from a [i]main-transformer (10KV/3x 230/395), sometimes voltage is even 233V. Forgot the date, when whole Europe, should have 240V (3x240/~400V), instead of the usual 220V.
One year, 2V upped, next year 3Volt's, then 2V., again. So electric equipment can be slowly adapted . Computer PSU's can handle a voltage range of +/-10%.
Only ordinairy lightbulb's can't handle more then 2%, halogen too.
Oh boy, I can sleep 1 hour . . .

I wouldn't worry too much about the incoming voltage. Your PSU will cope just fine with the variance. My incoming mains varies between 218V & 248V depending upon the time of day and what the load is like in the neighbourhood - i.e. cold weather = dimmer lights!

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I wouldn't worry too much about the incoming voltage. Your PSU will cope just fine with the variance. My incoming mains varies between 218V & 248V depending upon the time of day and what the load is like in the neighbourhood - i.e. cold weather = dimmer lights!

It's within the PSU's range. The fans are spinning, but I don't even see a BOOTSCREEN.
It consumes 150Watt's, no screen will come up. I'll first measure the PSU, when it's still in the casing. Btw a 650Watt Cooler Master.
Have no spare PSU. (Only a 145Watt in a PII (Compaq))Not gonna try that, won't 'fit' anyway.
Or the 3.3Volt part of the PSU is gone or more, I'll rest another hour, make coffee, then try to measure the PSU. It's easier when it out of the case, but more complex to measure.
(A resistor 3,3Ohm 10Watt, current would be 1A and 3.3Volts should be measured.)

I'll post, if I figured out what it is, if not too long.
The previous PSU, stopped with a loud bang, a few capacitors, I think.Mostly, they die silent . . . , doesn't do anything at all.
Anyway thanks for all the answers, Ill find it. And ofcoarse, have Digital milli-Voltmeter, a kill-a-Watt, so I can check it's In- and Output.

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if the fans are turning and you get no boot screen, I'd suspect the mobo first. Any beep codes? try removing your RAM and forcing it to beep.

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

Hi, after checking the PSU, with and without load, nothing wrong with that.
Then, IMO, it has to be the BIOS, cause not BOOT-UP Screen.
Removed battery/accu, shortcutted and emptied the BIOS. That was the culpritt, ssigghhhh.

When using both CUDA cards (G92's), the rig uses between 275 - 350Watt.
Haven't really OC'ed, it, won't want it to crash again ;-)
(3215MHz for now, when it doesn't get too hot and keeps stable, I'll up frequency and Vcore(plus a few other parameters, have lost all my setting's, from my BIOS, so a bit more to do.
(I did try a 450Watt PSU, which immediatly crashed and even BSOD's, when CUDA kicked in. Too little overhead.

Glad it works, with no additional cost's, only a Voltmeter and a 'Kill A Watt'. Which I already have.

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Hi, after checking the PSU, with and without load, nothing wrong with that.
Then, IMO, it has to be the BIOS, cause not BOOT-UP Screen.
Removed battery/accu, shortcutted and emptied the BIOS. That was the culpritt, ssigghhhh.

When using both CUDA cards (G92's), the rig uses between 275 - 350Watt.
Haven't really OC'ed, it, won't want it to crash again ;-)
(3215MHz for now, when it doesn't get too hot and keeps stable, I'll up frequency and Vcore(plus a few other parameters, have lost all my setting's, from my BIOS, so a bit more to do.
(I did try a 450Watt PSU, which immediatly crashed and even BSOD's, when CUDA kicked in. Too little overhead.

Glad it works, with no additional cost's, only a Voltmeter and a 'Kill A Watt'. Which I already have.

Before you scuttle the unit.......buy another PSU of correct catpacity......(no pun intended.....LOL) and sub it in.
I have had more than one rig fail with not apparent ill effects........and a PSU sub launched them back into life...............
Before you start tearing it apart....you must.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster

Hi Mark, no ploblems with the PSU, I 'upped' the CPU to 3450MHz and no problems,
It's 650Watt PSU, wasn't the culprit, somehow, BIOS won't respond.
Maxed out on 375 Watt, with CUDA, working, did empty the BIOS and got it going again.
All is OK now, this PSU has enough catpacity :).

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Hi Mark, no ploblems with the PSU, I 'upped' the CPU to 3450MHz and no problems,
It's 650Watt PSU, wasn't the culprit, somehow, BIOS won't respond.
Maxed out on 375 Watt, with CUDA, working, did empty the BIOS and got it going again.
All is OK now, this PSU has enough catpacity :).

Good mews!!

Happy that you got it sorted.....computers can be a hard nut to crack sometimes.

I have spent many hours staring at a bios screen saying...WTF?

I mean, like...Dude, those settings worked yesterday...LOL.

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"Freedom is just Chaos, with better lighting." Alan Dean Foster