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  My Computer Will Not Turn On! 
 Date Written 
Michael Greene Dec 21, 2007, 08:40am EST Report Abuse
My pc does not come on at all!
A few weeks ago I had to reset it about five times before being able to log on because it kept freezing whilst loading up. this happened every time I wanted to use the pc. Once it was on it worked perfectly.

now when I turn it on the modem tower is clearly on, the led's are on and I can hear it working. The monitor does not come on, it is plugged in (because the is an amber LED showing) but it wont turn to green (as it is supposed to when the computer is on) It just have a blank screen.
No matter how many time I reset it there is still no response.

Can anybody please help me figure the problem out??


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Bob Marley Dec 26, 2007, 01:51pm EST Report Abuse
>> Re: My Computer Will Not Turn On!
That's entirely to vague to diagnose.

Im assuming you don't hear any beeps coming from inside when you power the machine on either. First step is probably to try a different monitor, then a different video card and so on. Even if it does power on it could still be the power supply(and all you can do is change the ps and see if it works), but if onboard graphics/memory/cpu is the problem you will get BIOS error code beeps (unless the mainboard speaker is not plugged in).

Michael Greene Jan 02, 2008, 05:45am EST Report Abuse
>> Re: My Computer Will Not Turn On!
its as if the monitor will not come on even though the modem is running. I have tested the monitor by plugging it into a laptop and it works perfectly. so it cant be that.

the power supply is working fine because the LED's come on and the fan is working.

I am truly stuck with what to do next.

Chris McGee Jan 02, 2008, 05:55am EST Report Abuse
>> Re: My Computer Will Not Turn On!
The LEDs coming on is not an indication that the power supply is fine. If it is not supplying the correct voltages then everything will still spin up as normal but the PC will not post.

That being said, almost everytime i've seen something like this it has been either the motherboard or the CPU (usually the motherboard).

Try disconnecting (from both the power and interface connections) all the components except the motherboard, CPU, RAM and videocard. If it still doesn't work with just those parts connected then we know one of them is at fault. If it were the RAM or videocard then you would generally get beep codes telling you this, since you're not getting them my money is on either the CPU or motherboard with the PSU being the third (outside) contender.

Michael Greene Jan 02, 2008, 06:30am EST Report Abuse
>> Re: My Computer Will Not Turn On!
Thanks for you help, I appreciate it.

I shall try to find another power source and see what happens.

Until then, I am not sure what motherboards, video cards etc.. are, i am just a peasant in this world!

Is there anything else I can try without things getting too technical and me having to build a new pc!

Chris McGee Jan 03, 2008, 03:15am EST Report Abuse
>> Re: My Computer Will Not Turn On!
It seems to be a hardware problem so there's not much else you can do without getting your hands dirty.

PCs aren't that complicated anyway, once you open it up it's fairly obvious what the various things are. The motherboard is the largest board and sits flat to the back of the case. The CPU will be under a large block of metal with a fan on top which pokes out of the motherboard. If you have a separate video card it will come out of the motherboard at a 90 degree angle horizontally about 1/2 way down at the back. The RAM comes out of the motherboard aswell but is generally situated vertically and the hard disks will be at the front. I'll try and dig up a picture somewhere but it's fairly obvious when you actually have a look.

Could you let us know what type of PC you have and if possible the specs (CPU type etc)? This would be helpful in diagnosing any potential problem.

Michael Greene Jan 03, 2008, 04:40am EST Report Abuse
>> Re: My Computer Will Not Turn On!
I have opened it up previously because i thought that some dust or something on the hard drive my have been the problem. :P I know what you mean, although I am assuming that i will have to replace some parts.

As to what CPU it has i am unsure, it is a few years old (which may also be the problem!)

Thank for all your help

Stephen Duckworth Jan 03, 2008, 08:48am EST Report Abuse
>> Re: My Computer Will Not Turn On!
I had this problem a few weeks ago and it turned out to be my motherboard. If theres no beeps coming from it and the buzzer is plugged in then its either the motherboard or the processor thats the problem. You should check the graphics card if you have one and the power supply by plugging them into a different computer too.

The only way I found out it was the motherboard as opposed to the processor was by buying a new motherboard since I had no way to test the processor. I was planning on sending the motherboard back to the site I bought it off within the 10 days grace period if it turned out to be the processor. You might have to bite the bullet and guess on the motherboard, you dont loose any money if its not but its a lot of hassle sending it back again and getting a refund.

Michael Greene Jan 03, 2008, 10:06am EST Report Abuse
>> Re: My Computer Will Not Turn On!

Chris McGee Jan 03, 2008, 06:08pm EST Report Abuse
>> Re: My Computer Will Not Turn On!
As long as you don't drop the hard disk or something, your work and pictures won't go anywhere. If you're concerned about it then you can always put your hard disk into another pc and make copies of all the important things first.

john albrich Jan 03, 2008, 09:47pm EST Report Abuse
>> Re: My Computer Will Not Turn On!
Sneakydave said:
...You should check the graphics card if you have one and the power supply by plugging them into a different computer too....

You should never plug a suspect power supply into a known good computer/motherboard unless you're willing to sacrifice the computer. You run the very real extremely high risk of destroying that motherboard/computer.

At the very least, one should use a PSU test-tool (US$10-$30) and/or appropriate test equipment (e.g. DVM/oscilloscope) to evaluate the PSU before connecting the PSU to anything else.

While a PSU tester is not a 100% guarantee that the PSU is ok, it substantially reduces the risk.

BTW-I've found that some mobo/computer manufacturers, in order to produce the very cheapest mobo possible, are starting to exclude the piezo element or speaker that produces the audible "beep" codes. That means that some computers are unable to produce the "beeps" we often reference in our posts.



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