Comp shuts off after a second after turning on. Help to find the cause?

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There is an old comp, judging by the firmware motherboards - 2006, which is used as NAS storage. Characteristics at the end of the under spoiler.

Problem:
• When you turn the computer starts, begins to rotate the cooler, and after about a second after pressing power off. Sometimes manages to squeak built into the motherboard signal. Sometimes he can't manage. After that the power button no longer responds until you do not turn off the power supply button or from the outlet
• After the voodoo to disable components (see below) booting, and the bios displays an error message AI Overclocking failed... and you choose to load defaultnya settings or to enter and configure the bios. But the fact that I did not disperse, and the problem is evident even on default settings.

Playback issues:
• If after a standard shutdown from the system the computer idle all night, in the morning he can no longer turn on.
• If you turn in a few minutes after shutdown, the computer always starts.
• If nothing is disabled in the periphery, then the computer will not start, only helps disabling some components. In this way the contrast of this topic. There from a friend wih helped off the PSU for 20 seconds.

A temporary panacea:
As already said helps disabling some components. And always different:
• Sometimes the computer is got after the extraction of one strip of RAM. And sometimes only after removing both straps.
• Sometimes it helps to rearrange the RAM from one slot to another (in cases when there is only one strap)
• Sometimes it helps to disconnect the monitor from the VGA input of the computer
• Sometimes triggered if you eject the flash drive and keyboard from the USB ports
• Sometimes when you disconnect the LAN cable from the network card (network card fitted)

Localization issues:
• Replaced the thermal paste on the CPU and the North bridge — the problem persists.
• Obviously, if you disable the individual components and the problem persists - then blame not those specific components. T. O. RAM, HDD, keyboard, monitor, are likely not to blame.
• Visually, the motherboard is clean. Swollen capacitors on the motherboard, no signs of corrosion no. Sledov mechanical damage.

Not tried:
• Do not change the power supply since take it anywhere, even at the time, and buy a new one for the test - not reasonable. If you find out that he is guilty, probably will have to buy.
• Seems to be problems with the electricity network in the new house. The system unit is connected to the same outlet, the monitor, on the other. Directly. Without a network filter. It is not present. To buy makes no sense.
• Do not change the thermal grease on the South bridge. Her condition is not yet know open not in a hurry, as I read the reviews on this motherboard - some guys when removing the heatsink off the chip. So if you try to change, in the the very least.

Features:

• Motherboard - Asus P5GZ-MX Rev. 1.xx, MB-1234567890 (full specifications of the motherboard)
• Power supply is colorsit 340u-fnm ATX12v (version1.3) P4, 300 W
• CPU - Intel Socket LGA755 Pentium 4, 3GHz, 64bit
• RAM - 2 Kingston dies
• integrated graphics output for VGA
• Built-in 1Gb LAN
• Peripherals: LCD monitor, via VGA, keyboard, USB flash drive, which constantly sticks to the system unit.
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4 Answers

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Options (in addition to BP, which is highly suspect):
- the battery has non-volatile memory;
- BIOS, sometimes it helps flashing the same chip, and sometimes it's just a replacement chip;
- no swollen capacitors does not mean that they are normal
- look inside the PSU on the subject of swollen capacitors (again: the lack of bloating is not a sign of a good capacitor, but the presence of swelling-definitely a bad sign)

Will not prevent a hardware reset of the BIOS (on the motherboard usually have contacts, oboznachenie CLR_CMOS, they need to be closed for a few seconds WHEN COMPLETELY de-ENERGIZED the system unit)
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Sometimes manages to squeak built into the motherboard signal. Sometimes he can't manage. After that the power button no longer responds until you do not turn off the power supply button or from the outlet

Only this and limited - PSU goes in protection (otherwise it would have started again without a full network outage).
The reasons may be different. But check it out just enough to replace the PSU with a known good. Well or to replace components one by one - percent, mother, memory, video that harder and longer.

If, after a standard shutdown from the system the computer idle all night, in the morning he can no longer turn on.

Confirmation of a fault that is BP. Moreover, I hat to cut off - a problem in "dry" capacitors - night they cool down and "lose" all the features, when enabled, they are a bit warm and slightly restored (as we know from school - in the heat of a chemical reaction to proceed better).

Unlikely, but still there is a possibility of a power failure the motherboard.

Did not change the power supply since take it anywhere, even at the time, and buy a new one for the test - not reasonable. If you find out that he is guilty, probably will have to buy.

Oh :(.

Then there is another option - to come to the store with the system unit and say buy BP if everything will fit. Moreover, it is free - Zozpp. Don't fall, if you will require extra payment, I can only ask a kind of "pledge", but if you don't like BP, or no matter what - return the PSU with the words - "not approached", you return the money.
Well or come with a computer to the friend, acquaintance, neighbor, work.

And anyway, what do you suffer, if you are even able to replace the thermal compound and determine swollen capacitors on the mother, it is easy to Unscrew 4-8 screws or the screws fastening the PSU and see vspuchivaetsja capacitors.
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With probability 90% - dead power supply or the food chain Mat. Board. Conder corny dry.
If the computer is unstable included is nutrition the vast majority of cases.

Visually, the motherboard is clean. Swollen capacitors on the motherboard, no signs of corrosion no.
It happens that capacitors Suhut is visible to the naked eye, they simply inflates and fills the entire electrolyte.
But more often they quietly dry to the naked eye is invisible, they are like new.
You are able to visually distinguish a dead battery from fully charged?

Seems to be problems with the electricity network in the new house.
What is the relationship to the mains is the novelty of the house?
Neighbors - that's what is relevant.

Did not change the thermal grease on the South bridge
What does this may have thermal paste???

Did not change the power supply since take it anywhere, even at the time
But how do you then going to find and eliminate the cause??? No diagnosis of any version - stupid hot air.
Heard the advice - checked.
This requires the substitution of known good components, PSU, memory, Mat. Board, drives, peripherals.

Motherboard - Asus P5GZ-MX
The fee is just one of those polls where problems with the electrolytes according to the age of the Board - 10 years, they have came over..
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Multimeter neighbors\\friends\\friends to take there is no possibility?
I'd looked on the chains, on symptoms it's either the PSU or the mother.
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