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Dead pc, but On button lights up

By badboycavalier ·
The motherboard led lights up, and the power button will light up when it is pressed, but nothing powers up. What could this problem be???

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by ctrservices In reply to Dead pc, but On button li ...

First, suspect a malfunctioning power supply. The easiest way to check this is either borrow (or buy) one and try it. The other way is to test it with a VOM (if you are handy and know the correct procedure and voltages used for your system). Be sure to ground your self and not to touch any metal connectors inside the case.

Next, check memory. If you have two chips, usually one will be good. Try each by itself in the first memory slot (remove all add-in cards except video when checking memory).

Other problems could be the CPU, an add-on card or MB.

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by winikeh In reply to Dead pc, but On button li ...

Unplug the power cord from the computer and hold the power button pressed for about 1 min. Sometimes it does not shut down properly and leaves trace power in the system. This technique will remove any trace power and allow a normal cold start

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by Sue T In reply to Dead pc, but On button li ...

First check to be sure everything is properly seated and connected on the motherboard. My personal experience has always been a bad motherboard but power supplys can do this also so if you have another one you can use to test with try it. Does the num lock key light up? If so then also check to be sure your monitor or video card is not the problem. I would also try a different outlet and power cord.

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by dfornet In reply to Dead pc, but On button li ...

I agree with the other posts, but lets take this one step further. After checking the p/s, and discharging the power button, try disonnecting the internal devices one at a time (hard drive, cd-rom, etc) by unplugging the power. Also if you have a low profile system that uses a riser card for the add-in cards, remove that and try to power on. Those are notorious for going south.

As far as checking the voltage of your power supply, most p/s's produce +/- 5v dc and +/- 12v dc to run the peripherals. And the LED on the system board would indicate that you are getting +5v dc to the system board.

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by dfornet In reply to Dead pc, but On button li ...

I agree with the other posts, but lets take this one step further. After checking the p/s, and discharging the power button, try disonnecting the internal devices one at a time (hard drive, cd-rom, etc) by unplugging the power. Also if you have a low profile system that uses a riser card for the add-in cards, remove that and try to power on. Those are notorious for going south.

As far as checking the voltage of your power supply, most p/s's produce +/- 5v dc and +/- 12v dc to run the peripherals. And the LED on the system board would indicate that you are getting +5v dc to the system board.

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by hnhwc In reply to Dead pc, but On button li ...

I recently went thru the same problem and was about ready to trash the unit. As a last ditch effort I disconnected the present HD and connected another HD from a other system that was working. To my suprise every woked on the dead PC. I was then able to connect the existing HD as a slave and ran the checkdisk fix all command on it. I ran the chkdisk command on the slave 2 to 4 times. Then, I reconnected the original HD as the master, everything worked as original.

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by hnhwc In reply to Dead pc, but On button li ...

I recently went thru the same problem and was about ready to trash the unit. As a last ditch effort I disconnected the present HD and connected another HD from a other system that was working. To my suprise every woked on the dead PC. I was then able to connect the existing HD as a slave and ran the checkdisk fix all command on it. I ran the chkdisk command on the slave 2 to 4 times. Then, I reconnected the original HD as the master, everything worked as original.

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by Aaron A Baker In reply to Dead pc, but On button li ...

Hello there;
As you know, the Computer upon start-up, will do a series of self checks.
I read here that it goes through the process and then stops cold, i.e. it won't even read the Hard Drive.
As I would go through the process mentioned earlier, Make sure your connections are all ok, "Especially" the Yellow [12 Volt} part as they tend to weaken and sometimes can't read right.
Then I would clear the CMOS.
Once you've done that, try it, still the same?
Now it's time for the Ram Tests. Hopefully you have more than one, just take them out, one at a time, the system will start, but it will be slow, then invert the process. It could also be that you added Ram and perhaps didn't re-adjust your Voltage? i.e. 3.3volts to 5 As a last resort, I would switch hard drives if you can.
The system is not completing it's cycle and that's why it stops. Trick is to find out what is stopping it.
I'm willing to bet Hard Drive or Ram, but you won't know that until you've tried all the tests, sorry.
I would definitely Clear out the CMOS, as it may be trying an old boot and you need a clean boot.
If you can get into the BIOS setup, load setup defaults and go from there.
I'm going to give this a little more thought.
Regards
Aaron
Good luck.

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by CO@TINGS-Geek In reply to Dead pc, but On button li ...

Make sure the input power matches what the system requires. There are some servers that only run off of 220V and the markings to indicate that are not always clear. If you plug 110V into a 220V server you will usually get the symptoms that you are describing.

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by wbs_aus In reply to Dead pc, but On button li ...

If all the above doesn't fix the problem I would do a physical survey of the motherboard for leaky capacitors. I found this on a couple of problematic motherboards. Put "leaky capacitors" in your favourite search engine to see pictures and fixes.

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