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Computer Powered off and now won't turn on?


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#1 Crypto6

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Posted 17 December 2014 - 01:50 AM

I recently upgraded the CPU yesterday and the computer was running in perfect condition yesterday and today. I was playing a game and about a minute after I was done playing the game and was exited onto my desktop... my computer powered off.

So I waited about 30 seconds and turned it back on... it didn't turn on. The speaker that will beep never beeped- and the only thing that happens is the LED lights will dimly turn on. I had to turn my PC off by flicking the switch on the power box in the back. But no display- no nothing. The only fan that will turn when it is on is the rear fan and it barely spins. Aside from that- only LED lights from my fans will turn on and its dim. Is it a power box failure?

 

My computer is custom built!

 

NEWEST CPU: AMD FX 8350 (Previous one was a 6200)

Motherboard: Gigabyte GA-970A-UD3

RAM: Crucial Ballistix Spot 16GB

Storage: WD RE2-GP 1TB 3.5" 7200RPM

GPU: Sapphire Radeon HD 7870 GHz Edition 2GB GDDR5

Case: Sentey GS-6400 Arvina ATX Full Tower

Windows 7 Home Premium

 

I only know my power supply is 550W. I had a PC repair place swap the one I have now with one that was defective back when I was building the thing and had issues.



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#2 zingo156

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Posted 17 December 2014 - 08:54 AM

Sounds like possibly a psu problem (again unfortunately). The easiest way to figure that out is to replace it if you have the option. It is possible it is some other hardware issue so below are some other things you can try, I would recommend testing with a different psu first if you can....

 

Make sure you have the computer unplugged from power while removing or moving any hardware.

 

Try 1 stick of ram in 1 slot at a time (remove all other ram sticks). Move it to the next slot until you have tried that stick in all slots by itself. If you still have no post, try a different stick of ram in each slot by itself. If you have issues with the stick in 1 particular slot (a no post for example) the slot may be bad. It is also possible you have a bad stick of ram instead of the slot being bad, in this case the ram stick should cause the same problem all slots.

 

You may have a memory controller issue in which case if you have 4 slots, 2 may not work. With intel it should be 2 slots next to eachother channel 1 might be slot 0,1 and channel 2 might be 2,3. Trying with 1 stick at a time in all 4 slots is the best way to test everything.

 

If you never get a stable system with just 1 stick of ram in 1 slot (trying all sticks by themselves) try removing all non essential hardware to get into bios:

 

Disconnect pci cards, pci-e cards - except a video card unless you have onboard in which case use the onboard video and pull the video card, hard drives, dvd drives, disconnect all usb headers as well. You should only have the power supply, main board, 1 stick of ram in 1 slot, the cpu and cpu cooler connected. You can also plug in a monitor and keyboard. Now try to power on the machine. If at this point you have no post screen or video etc, unplug the computer and pull the stick of ram, power back on and listen for a post fault beep code, you will need to hook up a motherboard speaker to hear any post fault code.

 

If you get no response next: remove all of the components from the computer case and connect only non essential hardware outside of the case, place the motherboard on a non conductive surface, a wooden table will do fine. Then try to power on again, you can short the power button pins on the motherboard, don't worry this is exactly what the power button does. Just touch a metal item to both power button pins to try to power the mainboard when outside of the computer case.

 

While you have the computer apart, look for blown or bulging capacitors on the mainboard and video cards etc examples: https://www.google.com/search?q=bulging+or+blown+capacitors+motherboard&noj=1&source=lnms&tbm=isch&sa=X&ei=Iz_YU6aDLsS2yASnjoKwAQ&ved=0CAgQ_AUoAQ&biw=1031&bih=603 please report any caps you suspect may be bad, you can take a picture and post here if you are unsure.


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#3 mjd420nova

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Posted 17 December 2014 - 03:41 PM

A multimeter will confirm the lack of power but some voltage.  The cause, start with square one, just the MOBO and one memory stick and add pieces until the fault occurs.  I do suspect the power supply and none of the PC components.






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