PC Will Not Turn On

By luc209 ยท 9 replies
Sep 4, 2005
  1. TS community:

    My old Compaq desktop has been having power button trouble for some time. The computer would never turn off using the main power button. For two weeks I used the main power supply if I needed to turn the power supply on or off.

    Now, however, the computer will not boot automatically when plugging the power in. I have the case open and there is a small green light lit up on the mother board near where the power button plugs into the MB.

    I get no sign of life from either plugging in the Comp or pushing the power button.

    Any ideas?

  2. tdeg

    tdeg TS Rookie Posts: 119

    Possibly a power switch?

    What model of Compaq is it?
  3. luc209

    luc209 TS Rookie Topic Starter


    Its is a Compaq Desktop 6266 EP series.

    Could be the power switch, because that was giving me problems. Yet, the computer would turn on and off using just the power cord before, now... nothing.

  4. comp-rebuilder

    comp-rebuilder TS Rookie

    Wont Power On

    I have Been building computers for the better part of 10 years and I have seen everything imaginable.
    Basically in a Nutshell what has happened is by you using the main Power supply to turn your puter on and off with has caused power spikes and voltage irregularities in the MB itself and over time has fried the MB itself the green light that comes on is just a power indicator showing you have voltage feed but it is not getting past the regulaors and capacitors.
    I would suggest you pull the mainboard out and replace it with a compatible MB and check to make sure the irregularities havent damaged the processor as well.
    If both MB And cpu are dead I can offer to pay the shipping to me I recycle All computer parts so I can take the dead stuff off your hands But nonetheless try a new MB it should come back on its original start up and DO REPLACE THAT BAD POWER BUTTON!!!!
  5. DonNagual

    DonNagual TechSpot Ambassador Posts: 2,406

    The green light means the voltage is not getting past the regulators and capacitors? Not on any motherboard I have ever had... It means that the motherboard is getting power, period. Nothing more, nothing less.

    Before we assume his motherboard is dead, why not test the power switch first?

    luc209, I don't know how much you know about computers, but there is a way to bypass your power switch. This is not recommended if you are not familiar with the guts of a computer case.

    Open your case, and find the cable going from your case's front power switch to your motherboard. It will have a two pin connector plugged into your motherboard. If you remove that cable from the motherboard, then take a screwdriver, and use it to touch BOTH of the two pins on the motherboard (the ones you just revealed by removing the power switch cable) your system will turn on (if the problem is just the switch). NOTE: this is a dangerous thing to do. If you accidentally touch the screwdriver to another pin, or worse, to the side of your case while touching those pins, it will magically make a puff of pretty smoke and a funky burning aroma.

    Again, not recommended if you have never opened a case before. Take it in to a pro, or have a friend who knows computers do it for you to test your power switch.

    If this test turns on your computer, your problem is simply the power switch. Very cheap to replace.
  6. comp-rebuilder

    comp-rebuilder TS Rookie

  7. DonNagual

    DonNagual TechSpot Ambassador Posts: 2,406

    I am not sure we are talking about the same thing here, or perhaps you are speaking of older systems (with which I fully admit I have no knowledge of). The only setup I have ever seen is where the power switch cable (the one on the front of the computer case) plugs directly into the motherboard, never into the power supply itself. And I am not talking about cutting any wraps off any cables (not sure where you got that idea). I am talking about unplugging that cable from the motherboard.

    I am all for people saving money when possible. That's what this site is for, is it not? Then again, there are times when people can do more damage than good, and it's best to take it in. Hard line to draw and I am sure we're all doing our best to make that distinction.

    Hey, if he has a power supply tester in his hands, I agree. That would be a good thing to use at this point. ;)

    But... am I misunderstanding you again? It sounds like you are saying that you think if there is a green light on the motherboard, that it means the power switch (the one on the front of the case) is therefore fine? That is not true on any motherboard I have ever owned. The power switch on the front of the computer case has nothing to do with whether or not the motherboard is receiving power from the power supply.
  8. comp-rebuilder

    comp-rebuilder TS Rookie

    Older Power Supplies

    I know which PS you Mean the Newer Ones Do Have a Cable that connects to the Mainboard In Fact All Of them Do The Power Supplies that range from 100W up to 300W Have a Power Button Hardwired into them and they use a Heat shrinked rubber around the button screws that is the wrap I was referring to.
    But yes trying to disconnect the Power Cables from the MB might work as well but it might not too.
    I am having a similar computer issue to his Power it up and nothing happens the green light is on but not all the Ponies are running I am trying a few different things like a new MB and then a New PSupply If none of it works then I will scrap the system.
    I was not trying to argue with you over this I was Just trying to give some possiblities of how to cure that sick lil system is all You have a Great Day Just the Same :)
  9. Have you tried the "Kick Maneuver" ;P
  10. Tedster

    Tedster Techspot old timer..... Posts: 6,002   +15

    that's a real good technique.

    Normally I emplace boot force onto side panel. Using whack stick, slap top side with vigorous oral coaxing.

    If computer responds, slap keyboard., if not, repeat!
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