Green light on back of hewit packard goes dim whenever the power button is pushed and the computer will not power up or show any signs of life. I did a voltage test with a voltmeter and all voltages seemed fine when shorting pins 15 an 16 on motherboard connection

Please check whether the adapter is working fine

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when it power on, your monitor power led turn to green or orange? if its turn to orange, your video card migth be the problem..

Hi there
Sounds like a common problem
when you plug the power pack into the laptop its power light goes off because there is a fault. Most commonly this is connected with the plug or the socket into which it goes or the motherboard.
visually inspect the socket, if the central pin is loose thats your problem, if not then check the plug/jack bend the cable on it as these are prone to breaking. wiggle it around whilst checking the power button and status lights if none of that works then you need to strip the laptop and perform a continuity test on the first stage.
ie between socket and motherboard. please note for any sign of exposed cable and remember electricity hurts on contact be carefull. especially if you test motherboard for voltage.
ps the switch is pretty reliable and i would not poke anything in that hole just yet.

Hi, I had a computer monitor that acted similar one time and what I found were that there were some bad capacitors in the power supply board inside. They were identified by the swelled up rounded ends and the heat discoloration of them. They look like little aluminum cans with a vinyl sleeve shrunk around them with the component values written on them. A normal one is flat on the end with no signs of any leakage around them of a brownish blackish substance similar to wax or tar. They are relatively inexpensive at an electronics supply store($1-2 each) so I replaced them all. This will require some soldering and electronic repair knowledge though. The power supply could not stabilize so it just kept shutting down the picture that only displayed for a brief instant.
Good Luck!

Sorry to say, but it sounds like you power board is due for an overhaul.
It should be fixable since it does show signs of a little life left in it.
It would have to be taken apart. A visual may tell for sure.
Look for bulging capacitors (canister looking things) This a sign of a typical failure.
Of course, not all capacitors bulge when they go bad. That would make things too simple !!
ebaysbammbammfran

two case trouble reason and need to do:
1) back light driver (inverter) works not stable and DC power protect. it near some component damage, should repair inverter by egineer.
2) back light (lamp) over life cycle so protect by the inverter, should change new lamp (regular parts)
3) DC power supply not stable or component over life( wave filter capacitor), should be replaced

blank_page Use a reset sequence on the monitor-
1. turn off monitor
2. unplug power
3. plug power back in, holding down the last button on the left, then push the power button to turn back on and off three times, holding on the third try until it comes on- hold for ten seconds and release; the monitor should work again

Power supply has died

Unplug it and hold the power button in for up to 60 seconds to discharge.

Is there an I/O button in the back of the computer? Make sure it is set to I.