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CPU is Not Powers ON,but Boots Automatically After 2 Hours

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I am new user now,but i saw some solutions that makes me believe and trust on you that i can get 100% satisfaction solution from u.
About my Home PC problem is:
By the past 4 days ,Our PC is not booting when i press the CPU button,no LED light in CPU button,no fan sound inside CPU,nothing else.
When i kept this machine like this after 2 or 3 hours, when i comeback and see, our Home PC is booting up automatically and opening OS smoothly, there's no inbetween error or anything else, just running smoothly.
But if we shut down and switch ON the CPU after 30 minutes or 1 hour, the above same problem exists as we press the CPU button,it doesn't powers ON...but if we see after 3 hours , our PC is booting up normally without any error screen messages and opening my OS Vista Ultimate and also XP [dual OS]

Even i tried without UPS,directly plugged into wall power socket to boot CPU,nothing happened.

what might be the problem happening like this always, any SMPS power problem or in motherboard or in memory RAM card, or in Backup UPS or ...what exactly the problem it is happening everytime for us.

Please HELP US that i mostly trust U

our Home PC configuration as below:
Intel MotherBoard DG35EC
Intel Core 2 QUAD Processor [email protected]
OS - Vista Ultimate 32-bit operating system[service pack 1]-First option
- XP Professional Service Pack 3
Monitor- 19inch LCD Viewsonic VX1940W
DVD writer[internal-serial-ATA]- Samsung SH-S223F
Video and Sound- Inbuilt motherboad
SMPS - 400W
UPS -APC Back-UPS ES 500

Above PC system bought one year ago[december2008]

Edited by arulprakash, 10 November 2009 - 01:18 AM.

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Hi arulprakash and welcome to Geeks to Go.
We are a volunteer forum, so there could be a few others popping in with suggestions.

Based on the info that you have given, I suspect the power supply as being the problem (or the main board).

In simplified terms, the computer will turn on with the following steps.
1. Push the power button.
2. Momentary contact on the board.
3. A signal is sent to the power supply to turn on.
4. The supply turns on supplying voltage to the rest of the board, hard drives, and other peripherals.

The psu (power supply) you have (SMPS 350) is by todays standards very low for output wattage (350).
You are asking it to do alot.

Who is the manufacturer of the computer? Dell, HP, gateway, home built?
It matters because it could be proprietary where you can't get 1 off the shelf.

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Thank u for ur reply

Sorry to inform my correct current SMPS is 400W, my PC is assembled with branded components with help of my known computer engineer friend[very distant friend]

Also i want to mention about my motherboard that i saw a green light still glows in my motherboard without this CPU doesn't boot, also even when in working condition, my PC time also going slowly within this 1 year to complete my 1 st New Home PC system anniversay. How is it possible that my PC time changed slowly, always keep on changing every time .
My Latest situation is from sunday onwards , my PC didn't boot at al even when i press the CPU power switch button in the morning,then no boot up..
By the previous day i switched the CPU power switch ON in the morning, then in the evening at 5:30 only, my PC booted up and worked normally till my night sleep before go to bed. Then on next day[sunday], i cleaned my PC to remove some dust with soft brsuh, not by disconnecting all the pwer supply,just removed all the connection by the back of the components like monitor wire,mouse,keyboard,ethernet,speaker wire,..and also remove[unplugged] my 2 GB RAM memory card and put it back into same slot, didn't do disconnected Hard disk cable,DVD drive cable, and rest of the taht was connected to motherboard, ididn't touched it at all.
Then my PC didn't totally booted up till i waited for the evening and also by night time.
Till so far i didn't touched my CPU because of nervous and if i touch it didn't go wrong by major problem of afraid.
Tell me so far i told my PC condition now, what might be the problem exactly, then what i supposed to do now.
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How old is the computer?

I need to confirm that you are having to change the time by the clock on a regular basis. Is this correct?
The time changing is usually an indication that the battery on the main board needs to be changed.
Usually the battery will last for quite a few years.

Please note that the time changing will not cause the computer to not boot.

I am suspecting an intermittent power on switch, a bad power supply, or a bad main board.
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