why is the pc booting at times and then not booting at all

Hi
i have a pc that boots at times and then other times it will not boot at all. The fan cpu fan rotates for 2 seconds and the power led light appears and stays on but there is no sign of any other life in it.
However if i hold the power button in until the power led light turns off and then press the pwer switch it turns on
exdosAsked:
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nobusCommented:
i would start with checking out the CMOS battery (button like) it should read 3V.
I then would select default settingsd in the BIOS
Then, i would suspect the power supply (swap it for testing purposes)
Then i woulsd suspect the motherboard
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nobusCommented:
Also, in the bios check the Power on / off settings
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rindiCommented:
Sometimes this can be caused by the vga card. Try reseating it or use another one.
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rajeev_niceCommented:
I feel the system is going to Suspend mode when u press the power button shortly and does not come out of it when u press it again. But again when u press the buton for 4 seconds (delayed power off) then the machine shuts down and powers on after pressing power button again.

To solve the problem... try to see the power options... and disable the suspend mode... or set Power Off immediatly instead of 4 sec delay. These functions are controlled by ACPI/BIOS and Power supply in harmoney... if anything is misbehaving then u wud have such problems.

Problem with VGA can be ruled out because u wud hear 4 Continuous beeps if it has some problem with VGA which u have not reporting.

HTH.
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f-kingIT support technicianCommented:
What is your system specs?
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exdosAuthor Commented:
seems like the motherboard is intermittent. I have changed it and wil monitor the box
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nobusCommented:
>>>>    i would start with checking out the CMOS battery (button like) it should read 3V.
I then would select default settings in the BIOS
Then, i would suspect the power supply (swap it for testing purposes)
Then i woulsd suspect the motherboard   <<<<

Did you try any of those?
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exdosAuthor Commented:
tried different motherboard as first item to swap, the pc seems fine now. i will check the battery and change the bios settings to default, i will also try the psu with another build to test it. what si the additional cable that now comes with psu's (12volt cable) this also plugs staright into the motherbaord seperatelly to the main power connector.
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nobusCommented:
>>>   what si the additional cable that now comes with psu's (12volt cable) this also plugs staright into the motherbaord seperatelly to the main power connector.    <<< it is a power connector for the cpu, and has to be plugged in
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f-kingIT support technicianCommented:
Is your cpu a slot 1 or socket connection?
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exdosAuthor Commented:
12volt cable has to be plugged in or pc will not boot, maybe it provides direct power to the cpu

Is your cpu a slot 1 or socket connection?  sorry what the difference
it is a celeron 2.4ghz cpu and the mobo is a intel INTEL D865GLCL
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nobusCommented:
in a slot 1 you can get easier a bad contact.
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rindiCommented:
Being a 2.4 GHz Celeron it won't be a slot1. But while your looking at your CPU you can just make sure the Heatsink is seated properly and the fan running smoothly. clean the excessive dust away.
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exdosAuthor Commented:
i changed the motherboard a few weeks back and the pc has not caused any problems since
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