Tip & How-To about Computers & Internet

Computer will not power on, computer will not turn on

If your desktop computer will not turn on, you may have a bad power supply, bad wall outlet, bad power cable or a bad motherboard.

Through the process of elimination you can narrow down the problem.

-Some computer power supplies have a on/off switch on the back. Make sure the power switch is flipped to on.
-Make sure the power cord is firmly seated in the wall and power supply.
-Make sure the wall outlet you are using is working or try another wall outlet in your house.
-Try a different power cable. Desktop computer power supplies use standard 3 prong power cables. You can pick up one cheaply at your local electronic store and after testing you should be able to return it(check return policy).

If non of the above resolve the issue, you narrowed the problem down to the power supply or motherboard. The easiest to test is the power supply. If you have a extra compatible power supply you can use this to test. If it does not resolve the issue, you most likely have a bad motherboard and this will need to be replaced. The problem could lie with the two. If you feel comfortable with replacing/testing these components. I recommend going to www.newegg.com for your parts. It is a site I use often.

*Before opening up your computer and digging around inside, please be sure to make sure you have no static on yourself or discharge can damage your computer. Touch something metal(not the pc) or use a anti-static wrist strap.*


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1 Answer

connect and then disconnect my pc to put it back somewhere in the house but when connected no longer lit up again and I wonder if the motherboard could be damaged and would like to know how to check

Hi you need to check the power cable which connect the computer to the wall outlet,make sure it is properly connected and you should also try plugging the computer into another wall outlet.If the problem still exist use another power cable to connect the computer,if the problem still exist you will need to change the power supply in the computer,if you that don't solve the problem that would mean your motherboard is dead.

Aug 15, 2010 | Compaq Presario 5000 PC Desktop

2 Answers

dell dimension 4600 will not power up.

Hi there if your computer is not receiving power you should try plugging it in a different wall outlet first, if the problem still exist try a different power cable. If the problem is not solve you should change the power supply,and if the computer still does not receive power the you would need to replace the motherboard.

May 19, 2010 | Dell Dimension 4600C PC Desktop

1 Answer

My PC will only turn on for 1 second and then shuts down. I've disconnected everything such as fans, hard drives. I put on a new power supply box and CMOS battery. Can the switch in the front be faulty?

Is your computer plugged-in to a power bar?

If yes kindly disconnect it from there, then try to plug-in your computer's power cable directly to a wall outlet, you can also try other wall outlets, if this one will still not work, there might be a problem already with the motherboard.

I also encountered this problem before.

Mar 01, 2010 | Gateway GM5084 PC Desktop

1 Answer

Orange Light permanently on motherboard. PC won't start

1. motherboards for atx form factor pc's are powered even when the computer is off, particularly if you leave the computer plugged in to wall outlet... you better do not work on you computer while power cable is still connected to both, your pc and the wall outlet..

2. I found this thread that may be helpful, it may be the motherboard may have gone bad, cmos is corrupted or something may not be seated properly...it could also be one of these: Bad CPU, BAD ram, Bad power supply.. read the thread for details:

Sep 24, 2008 | Dell OptiPlex GX260 PC Desktop

1 Answer

compaq intel pentium 42.8ghz512mb

How old is your computer? Did you recently have a power outage or anything? Most the time if a computer won't turn on, something in it went bad OR an outlet is bad. Try this:

1. Make sure that the power switch is on, the switch in the back (on the power supply itself) is turned on, and everything along those lines is functioning.
2. If that doesn't work, and it will not power on AT ALL, make sure the cords are plugged firmly in place, including the surge protector and/or the power cord itself.
3. Try resetting the surge suppressor and/or plug the computer into a different outlet in the surge suppressor. Try other items in that surge suppressor (or even in the wall outlet, if that's what you're plugged into) to make sure that the outlet itself is working.
4. If your computer is plugged directly into a working wall or surge suppressor outlet, try a different power cord.
5. If your surge suppressor works, your wall outlet has power to it, and you are using a known-good power cord in the computer, you will have to go into more in-depth investigation as something inside the computer likely went bad. It could be the video card, motherboard, CPU fan, power button, or the power supply itself. Start by testing the video card and the power supply by (one at a time) swapping out a known-good component for the one you suspect may be bad. If it won't turn on after that, try swapping out the next and try it again. If it still will not work, it could be something more serious such as the motherboard or power button.

Good luck!

it could be a bad power supply or a bad motherboard. Other problems might cause issues, such as a bad video card.

Jan 16, 2008 | Computers & Internet

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