Computer wont turn on.

#1 samuel3

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Posted 07 April 2011 - 03:56 PM

Hi my computer wont boot up i had a new motherboard fit in. Got it back today worked fine. Then came back and the computer wont power on.

No lights turn on.

Tried 2 power supplys.
Checked fuses.
Took RAM out and back in
Computer is all connected up correcly.

Whats the problem?

#2 BeachBumLI

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Posted 07 April 2011 - 08:25 PM

Does it sound like the power supply is turning on when you try to turn on the computer (some fan noise, movement, anything).

My first thought would've been a dead PSY, but you said you tried multiple power supplies. Is it possible the power button was off on these power supplies when you tried them?

Double check the power button for your computer to make sure that the wire is plugged in, that the contact is hitting correctly when it's pushed, etc. Might want to try pushing the button from inside the case to make sure that it's not just a matter of the plastic from your case not hitting the button correctly. Just be careful that you ground yourself first and try not to touch any other parts so you do not short anything out.

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#3 Queen-Evie

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Posted 07 April 2011 - 08:46 PM

This won't explain why the system worked fine when you got it home, then wouldn't work unless you happened to somehow turn it off.

But it is something I have to ask regarding the 2 power supplies:

Is there an on/off switch on the back of the case, either just above or below the power supply? If there is, was it turned ON?

This post has been edited by Queen-Evie: 07 April 2011 - 08:47 PM

#4 samuel3

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Posted 08 April 2011 - 04:38 AM

Yes the switch is on.

#5 samuel3

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Posted 08 April 2011 - 04:53 AM

There is no noise, no movment. Nothing.

#6 BeachBumLI

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Posted 08 April 2011 - 05:05 AM

Ok, sounds like your PSU is not getting power at all then. Let's start with the basics; is the outlet working? Plug something else into the outlet to confirm this isn't the problem before you drive yourself nuts looking for the problem with your computer.

#7 samuel3

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Posted 08 April 2011 - 06:12 AM

I've tried 2 power supplys..

#8 samuel3

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Posted 08 April 2011 - 06:16 AM

Inside the computer these like 4 or 5 cables that are not connected I've taking pictures but im having trouble opening the drive.

#9 BeachBumLI

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Posted 08 April 2011 - 06:16 AM

Right, I get that. I'm saying to unplug your computer all together and plug something else (a light, a fan, anything) in to the outlet to confirm that the outlet is getting power.

#10 samuel3

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Posted 08 April 2011 - 06:19 AM

Oh, ive tried different plugs I've tried the computer at a different house. Still nothing happens.

#11 BeachBumLI

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Posted 08 April 2011 - 06:31 AM

What type of computer do you have (make and model?)

It really sounds to me like there is either a cable unplugged, or a switch off.

Did you move the computer or change anything between the time that it worked and didnt work?

#12 samuel3

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Posted 08 April 2011 - 06:34 AM

These is a few wires inside the computer that arn't connected.. 1 is a blue and white cable that goes near the power button at the front maybe its ment to be connected to the motherboard?

#13 BeachBumLI

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Posted 08 April 2011 - 07:08 AM

What type of computer do you have?

Can you take a picture of the cable in question and your motherboard so we can see if maybe that is the case?

#14 samuel3

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Posted 08 April 2011 - 07:43 AM

http://img827.imageshack.us/img827/8773/picture001rm.jpg

http://img573.imageshack.us/img573/2426/picture002vz.jpg

http://img849.imageshack.us/img849/79/picture003a.jpg

Its the blue/white cable with white socket that may be the problem?

The black/yellow cable with black socket in bottom left is the fan but the new motherboard doesn't support it.

The ones with bigger black sockets i dont know about.

And the blue orange white red one with black socket is the USB's at front of the pc?

#15 BeachBumLI

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Posted 08 April 2011 - 07:56 AM

Quote

The black/yellow cable with black socket in bottom left is the fan but the new motherboard doesn't support it.

Does this mean you are running the computer with no fan at all? This is not recommended as you could overheat and fry the MOBO.

The blue/white cable looks promising. Could you show us the other end of the cable (where it connects too) and also take a picture of your motherboard to see what sockets you have?

Again, what computer do you have?