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Windows 7: is my computer dead?

21 Sep 2012   #11
gazz9496

 
 

a failed psu can either stop working or take the whole computer with it.

hoping it's not the psu is one way to go but they aren't full proof and do fail even the best ones fail.

if it's the motherboard then again refer to the psu and get it checked, motherboards don't just fail for fun or to give you a headache.

and the power button...just check the cable and the end going to the board make sure 100% that it's connected to the right pins don't guess really make sure.

best of luck and hope to hear good news


My System SpecsSystem Spec
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21 Sep 2012   #12
alphanumeric

Windows 10 Education 64 bit
 
 

It could be any one of the three things you listed, I'm just going by what I know and what I think might have happened. There is a +5V Auxiliary power supply in the main PC power supply. It is always on, it only turns off if you unplug the power supply or turn the switch off on the back, if it has one. That +5V feeds the circuit on the motherboard that powers up the PC when you press the power button. That circuit feeds a signal back to the power supply and turns on the main switching power supply that powers everything. Originally your PC would attempt to turn on, so that circuit was working and the case power button was working. Now nothing happens so that means things have gotten worse. If you didn't unplug any cables or knock anything lose it should still at least try to power up. It can't hurt to go over all the connections and make sure something didn't get knocked lose. Also make sure you switched the power supply power switch back on. The proper procedure for diagnosing a fault like this is to disconnect everything not needed for the PC to post. All you need is the power supply, motherboard, CPU with heat sink, one stick of RAM, and a Video card if the motherboard doesn't have onboard video. If everything is working the PC should boot to the BIOS screen with those components. If it still won't POST the only way to find the culprit is to swap things out. I'd start with the power supply. If you think the case power button is not working you can unplug it and connect the reset button in its place. They are electronically identical. Then press the reset button and see what happens. If the motherboard wasn't damaged during the BIOS reset then something else happened to make things worse. At the very least I would reseat any add-in cards like Video and reseat the RAM sticks. Then check the power cables that go from the power supply to the motherboard.
My System SpecsSystem Spec
21 Sep 2012   #13
gazz9496

 
 

so many things to check xd, but as alphanumeric points out start from scratch as if your building the pc from parts alone then check every cable and every connection.

If possible have spare parts on hand.

check for any loose screws ensure none are wedged behind the motherboard.

I seen a very long thread on here once where it must have seemed like every member of the community had a thought or idea of what was wrong most different and that was a very very long thread, end result was a dog hair that is easily missed in a ram slot while trying everything else under the sun didn't help, morale of the story...check and recheck everything
My System SpecsSystem Spec
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22 Sep 2012   #14
marimuda

Windows Ultimate x64
 
 

thanks, will try
My System SpecsSystem Spec
30 Sep 2012   #15
marimuda

Windows Ultimate x64
 
 

Ok, I've figured out that the thing preventing my computer from turning on is the earth on the power supply, Because when i do some diagnostics on the 24 pin connector on the power supply and put a metal object from the green cable and into a black one, the fans start spinning..
is there any way to get earth connection again or do i need to change my power supply?
Or is it still possible that the problem is on the motherboard not getting the earth connection through the the 24 pin connector?
My System SpecsSystem Spec
30 Sep 2012   #16
Dwarf

Windows 8.1 Pro RTM x64
 
 

It sounds as though your system is working correctly, as when you short the green lead (PS_ON) with one of the ground (black) leads, the system comes on. I would check the connections to your front panel switches, to ensure that they are correctly fitted and working. As both the reset and power switches are of the same type, try swapping them over to eliminate the possibility of a faulty switch.
My System SpecsSystem Spec
30 Sep 2012   #17
xant420

Windows 7 ultimate x64
 
 

Dead or dying ram or video card can cause same symptoms too, have you tried stripping down to a barebones setup?
no video card or harddrive etc? can help sometimes.
Antz
My System SpecsSystem Spec
01 Oct 2012   #18
marimuda

Windows Ultimate x64
 
 

Quote   Quote: Originally Posted by xant420 View Post
Dead or dying ram or video card can cause same symptoms too, have you tried stripping down to a barebones setup?
no video card or harddrive etc? can help sometimes.
Antz
If the Motherboard and Power Supply is functional - and the problem was laying in the Ram or VGA, wouldn't there be any biiib sound code from the motherboard then?

or can an problem in vga/ ram make the computer totally dead , no led, no sounds, no fan.
My System SpecsSystem Spec
01 Oct 2012   #19
alphanumeric

Windows 10 Education 64 bit
 
 

Quote   Quote: Originally Posted by marimuda View Post
Quote   Quote: Originally Posted by xant420 View Post
Dead or dying ram or video card can cause same symptoms too, have you tried stripping down to a barebones setup?
no video card or harddrive etc? can help sometimes.
Antz
If the Motherboard and Power Supply is functional - and the problem was laying in the Ram or VGA, wouldn't there be any biiib sound code from the motherboard then?

or can an problem in vga/ ram make the computer totally dead , no led, no sounds, no fan.
Not always, but more often than not, I would expect a beep code if the motherboard was functional. The test you did shows that the power supply is probably OK. Its just not getting the turn on signal from the motherboard. So its either a motherboard fault or a defective case power button. As mentioned you can swap the case power and reset buttons and then try pressing the reset button to turn the PC on. Or unplug the case power button and momentarily short the two motherboard power pins with a screw driver.
My System SpecsSystem Spec
01 Oct 2012   #20
3D Jed

Windows 7 pro x64 SP1
 
 

Just because the psu fan spins when the power on is triggered doesn't mean all the various +5V +12V +3.3V etc are present on every connector. I recently had a failed psu where just one of the 5Vs was down. The OP should use a multimeter (less than 5GBP from Amazon) to check all the DC voltages.

Note to any noobs - be VERY careful attempting the power on short test at the 24 pin socket. Its easy to screw the psu if you short the +5V etc.
My System SpecsSystem Spec
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