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PC powers on automatically, no boot up

Forum Homebuilt Systems : General Homebuilt - PC powers on automatically, no boot up

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goldenwormz   12-28-2007 at 04:59:54 PM

When I turn the power switch on the power supply on the BACK of the computer, the whole computer turns on (fans running etc.) even though I did not push the on button on the front of the computer. The computer does NOT boot up, however. There is no response when I push either the reset or power switch on the front, so thus I can not boot up. I tried a different power supply but still get the same problem so I am thinking this may be a motherboard issue. Everything worked fine 2 days ago. What might the problem be? (using a GA-K8NS Pro board).

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rgeist554   12-28-2007 at 05:11:41 PM
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Could be the motherboard, I'm more inclined to believe that you didn't connect the front panel (PWR SW, HDD LED, etc.) correctly to the case. Double check them vs. your motherboard manual and make sure you have them correctly connected.

Also, check your CMOS jumper and ensure that it isn't set on the reset position, as this would cause trouble, but I'm more inclined to think you have an incorrect connection on the panel connections via the motherboard since it powers on as soon as you turn on the PSU.

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goldenwormz   12-28-2007 at 05:58:33 PM
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I should add the system worked fine for almost 3 years now, so MB connections should be fine. Also, will note that around 3 months ago that after I powered down normally from Wxp, the PS fan and other cooling fans would want to stay on in very low mode, thus why I turned the power off on the master switch. Obviously, this was a precursor to the current situation.

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rgeist554   12-28-2007 at 06:10:47 PM
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Quote :

I should add the system worked fine for almost 3 years now, so MB connections should be fine. Also, will note that around 3 months ago that after I powered down normally from Wxp, the PS fan and other cooling fans would want to stay on in very low mode, thus why I turned the power off on the master switch. Obviously, this was a precursor to the current situation.

Hmm, strange indeed. It may very well be a failing motherboard or PSU, maybe both.

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roadrunner197069   12-28-2007 at 07:00:14 PM
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After you switched PSUs you might have to reset cmos to get it going again. If that dont work then you probably hurt the mobo with the bad PSU.

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goldenwormz   12-28-2007 at 11:57:21 PM
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I've also tried the reset CMOS feature as well, even disconnected the power switch and reset connections to the motherboard, but same results. (You appear to have concluded my original PSU was bad, but I'm not so sure since I'm getting the same result with a brand new one.)

Any other suggestions? Or is it just a bad MB at this point?

Next, I plan to try a different MB from another computer to boot up and backup. Will this be that simple? Can I just pop in a different compatible MB and the hard drives will be recognized etc. without data loss?

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roadrunner197069   12-29-2007 at 12:15:34 AM
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goldenwormz wrote :

Next, I plan to try a different MB from another computer to boot up and backup. Will this be that simple? Can I just pop in a different compatible MB and the hard drives will be recognized etc. without data loss?




You can use a differnt mobo but you will neeed to do a repair from your os to get your drive to work and it can be risky.

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goldenwormz   12-29-2007 at 12:40:17 AM
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A "repair," what do you mean by that? The only way I would be able to get into the OS is by
putting the drives in a different system. So are you saying if I'm lucky enough for it to boot up
then I should be able to do the repair? (please explain).

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roadrunner197069   12-29-2007 at 01:01:25 AM
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You would have to boot from CD and do a repair as your hard drives have information from your other system on them that will prevent you from booting. So you do a repair and it resets some registry files and boot files. If it works your golden. If it dont you might have lost some data.


Message edited by roadrunner197069 on 12-29-2007 at 01:01:49 AM
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