Questions

Wwhats the h/w issue?

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Wwhats the h/w issue?

SystemCheck
recieve the computer with customer claiming mobo dead (according to geeksquad) saved them 250 doin it myself. press power button and nothing happens. fans dont move no new lights appear, double checked all power cables. opened the psu, saw some gunk on one of the capasitors and some more on a copper coil thingy. mobo light is green indicating its good, [psu doesn't have a light indecator ](unlike the last board, but still got the same symptoms). Im thinking that the power button on the front panel is somehow bad or the psu is bad somehow like as in not pushing enough power.
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    OH Smeg

    Some PS have Glue on some components to help keep them in place and this should be there.

    As for Power Supplies they have 3 Distinct Voltages these are 12 V DC, 5 V DC and 3 V DC and they need sufficient current for each Voltage Rail. All a LED illuminating is saying is that there is 3 V DC present and in no way implies that there is sufficient current on that 3 V Rail. It in no way implies that the 5 or 12 V DC Rails have any Voltage or Current.

    I would first test with a Known Good Power Supply and if that cures the problem the PS was shot. Of course it may do absolutely nothing at all or even destroy the Known Good Power Supply if there is a Massive Short Circuit on the M'Board.

    Recently I had a Customer buy a New M'Board, CPU, RAM, Optical Drive and HDD in an attempt to save himself some money by not bringing it to me and none of that made any difference. He wrongly implied that because the Fans Ran the PS was OK but when I replaced the PS the New Computer worked perfectly as it did when I replaced all of the Old Components.

    I then pointed out he had a Warranty for a reason and it wasn't necessary to buy replacement parts to fix a system under Warranty. Still at the end of that after he bought a new case he had 2 working computers.

    Col

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    hmm

    SystemCheck

    ill test the psu today

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    SystemCheck

    new mobo, tested with new psu, push power button, nothing moves

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    OH Smeg

    Well then pull the front off the case

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    OH Smeg

    And remove all of the crud from behind the switch. You should also check for badly molded plastic Parts in the guise of the actual push button which could be jammed in the front cover of the case.

    As the On Switch is just a Momentary Contact Switch you can use the reset switch to test the unit with as the Power On Switch.

    Col

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    SystemCheck

    i disconnected the wires from the panel and put a new switch on it and nothing, even tried the butter knife on the pin nothing. to me sounds like everything is pointing to a defected board.

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    SystemCheck

    mobo fries order new board get defective board and same symptoms... just my luck:)

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    TheChas

    Well,

    It could be the CPU or the RAM.

    Just as likely that a bad PSU damaged the original and the new motherboard.

    However, it would not hurt to check and make sure that the clear CMOS jumper is not set on the new motherboard. If the clear CMOS jumper is set, you get the same symptom as a dead system.

    That green light on the motherboard only verifies that the 5 volt standby voltage is present. No validation that anything actually works, or that the power supply is properly regulating the critical voltages.

    I use a cheap ($30 US) ATX power supply tester to test both suspect and new power supplies.

    Chas

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    _Papa_

    i don't believe you have the skills to be troubleshooting the guts of your computer, especially if it's under warrany!

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    0 Votes
    OH Smeg

    Some PS have Glue on some components to help keep them in place and this should be there.

    As for Power Supplies they have 3 Distinct Voltages these are 12 V DC, 5 V DC and 3 V DC and they need sufficient current for each Voltage Rail. All a LED illuminating is saying is that there is 3 V DC present and in no way implies that there is sufficient current on that 3 V Rail. It in no way implies that the 5 or 12 V DC Rails have any Voltage or Current.

    I would first test with a Known Good Power Supply and if that cures the problem the PS was shot. Of course it may do absolutely nothing at all or even destroy the Known Good Power Supply if there is a Massive Short Circuit on the M'Board.

    Recently I had a Customer buy a New M'Board, CPU, RAM, Optical Drive and HDD in an attempt to save himself some money by not bringing it to me and none of that made any difference. He wrongly implied that because the Fans Ran the PS was OK but when I replaced the PS the New Computer worked perfectly as it did when I replaced all of the Old Components.

    I then pointed out he had a Warranty for a reason and it wasn't necessary to buy replacement parts to fix a system under Warranty. Still at the end of that after he bought a new case he had 2 working computers.

    Col

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    hmm

    SystemCheck

    ill test the psu today

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    0 Votes
    SystemCheck

    new mobo, tested with new psu, push power button, nothing moves

    +
    0 Votes
    OH Smeg

    Well then pull the front off the case

    +
    0 Votes
    OH Smeg

    And remove all of the crud from behind the switch. You should also check for badly molded plastic Parts in the guise of the actual push button which could be jammed in the front cover of the case.

    As the On Switch is just a Momentary Contact Switch you can use the reset switch to test the unit with as the Power On Switch.

    Col

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    0 Votes
    SystemCheck

    i disconnected the wires from the panel and put a new switch on it and nothing, even tried the butter knife on the pin nothing. to me sounds like everything is pointing to a defected board.

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    0 Votes
    SystemCheck

    mobo fries order new board get defective board and same symptoms... just my luck:)

    +
    0 Votes
    TheChas

    Well,

    It could be the CPU or the RAM.

    Just as likely that a bad PSU damaged the original and the new motherboard.

    However, it would not hurt to check and make sure that the clear CMOS jumper is not set on the new motherboard. If the clear CMOS jumper is set, you get the same symptom as a dead system.

    That green light on the motherboard only verifies that the 5 volt standby voltage is present. No validation that anything actually works, or that the power supply is properly regulating the critical voltages.

    I use a cheap ($30 US) ATX power supply tester to test both suspect and new power supplies.

    Chas

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    0 Votes
    _Papa_

    i don't believe you have the skills to be troubleshooting the guts of your computer, especially if it's under warrany!