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Computer powers on, only boots up sometimes.


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#1 piratemcdaddy

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Posted 22 July 2009 - 06:31 PM

Computer powers on, only boots sometimes.

I'll hit the power button, fans will start whirring, and everything looks good, but no signal to the monitor.
To turn it off, I have to hold it down for at least 5 seconds, even if it has only been on for a second or two.

Other times, it boots on just fine, and everything works normally.
I've ran hardware diagnostics and there is no problems.

I tried a different PSU, I tried a PCI vid card instead of the built in vid card, I've tried starting without ide and sata connections.

Mobo is new.

Any idea what could be causing this?

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#2 fairjoeblue

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Posted 22 July 2009 - 07:56 PM

Didn't we just do this one ???

http://www.bleepingcomputer.com/forums/t/241896/reinstalled-motherboard-with-replacement-from-compaq-flashing-dos-prompt-no-post-no-bios/

Edited by fairjoeblue, 22 July 2009 - 07:57 PM.

OCZ StealthXstream 700W,Gigabyte GA-EP45-UD3R , E8500, Arctic Freezer Pro 7, 3GB G.Skill PC8500,Gigabyte Radeon HD 4850 OC [1GB ], Seagate 250GB SATA II X2 in RAID 0, Samsung SATA DVD burner.

#3 piratemcdaddy

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Posted 22 July 2009 - 08:13 PM

Different computer. equally frustrating. haaa :thumbsup:

I just want any suggestions as to what could cause such a thing.

The only thing I haven't been able to rule out is the CPU.

#4 fairjoeblue

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Posted 22 July 2009 - 09:27 PM

Check that it is set to use the video the monitor is attached to first in the BIOS.

Also, what brand/model is the power supply.
OCZ StealthXstream 700W,Gigabyte GA-EP45-UD3R , E8500, Arctic Freezer Pro 7, 3GB G.Skill PC8500,Gigabyte Radeon HD 4850 OC [1GB ], Seagate 250GB SATA II X2 in RAID 0, Samsung SATA DVD burner.

#5 piratemcdaddy

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Posted 22 July 2009 - 10:15 PM

Bestec, don't know the model off hand

#6 techextreme

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Posted 22 July 2009 - 10:23 PM

Bestec Power supplies are known for going bad and working "intermittently".

Best advice, Get a new power supply.

Hope this helps,
Techextreme

"Admire those who attempt great things, even though they fail."

-- Seneca

#7 piratemcdaddy

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Posted 22 July 2009 - 10:25 PM

I hooked it up to an antec 400 watt, which is plenty for that board. Same story.

#8 fairjoeblue

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Posted 22 July 2009 - 10:30 PM

Do yourself a favor, DO NOT try to start that unit again.

Bestec power supplies are best known for failing & frying the motherboard in the process.
It appears that yours is showing that it is on the verge of failure.
You will push the power button sooner or later [sooner from the sound of it] & it simply won't syart again.
The fans will spin & it will look like the power supply is working but the motherboard will be burned.
If you hook a new motherboard to it that one will fry immediatly too.

I wouldn't even plug the computer in until I changed the PSU.

BTW, Bestec power supplies are what gave emachine a bad name.
OCZ StealthXstream 700W,Gigabyte GA-EP45-UD3R , E8500, Arctic Freezer Pro 7, 3GB G.Skill PC8500,Gigabyte Radeon HD 4850 OC [1GB ], Seagate 250GB SATA II X2 in RAID 0, Samsung SATA DVD burner.




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