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PC shuts down randomly please hel,, exams comming up

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June 13, 2009 11:47:24 AM

Hello there, my pc can start up, enter windows and function completely normal until it randomly shuts down. It started out not so often, mostly while playing demanding games etc, sometimes i could go on for 5 hours other time it would take 1 hour or less. It's not heat atleast, i've checked the temps and it always running below 50C. When the PC shuts down it goes black for a few seconds until it automaticly restarts til the second boots screen where i just freezes, at this time the power on/off button doesn't work which it does before the shutdown. So i have to either pull the plug or the power button behind the case. After i do so the PC doesnt respond so i can't turn in back on. Here's the weird part, i just have to keep switching between two power cables, switch between on and off until it works, sometimes it takes 1 min other times i can take up to 5. Most of my PC is less than 4 months old

System:
Windows XP professional
4gb RAM
400gb Western Digital Harddrive
8800GT 512 mb Graphic Card
Gigabyte GA-MA69GM-S2H Motherboard
Tagan 500W Power Supply

The thing is that exams are comming up and i don't have a PC so im screwed if i dont get it working.
I then tried to reinstall Windows today, but now when i start the installation the pc shuts down after only a few minuts, so now i can't install windows or anything.

Appreciate any help PS. sorry for the wall of text

Thanks - Nytz
June 13, 2009 4:19:54 PM

check ur PSU, maybe it is dying. or maybe the HDD
June 13, 2009 5:03:34 PM

It's not the HDD, i've tried it on 2 other systems without problems. The PSU is only two month old but i'm gonna find another one to test it out fast
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June 13, 2009 6:13:59 PM

which proc do u have?
a b B Homebuilt system
June 13, 2009 7:15:28 PM

My money would be on the PSU.
June 14, 2009 7:36:19 AM

Upendra09 said:
which proc do u have?


Proc? Sorry i'm a bit new to hardware
a b B Homebuilt system
June 14, 2009 8:21:16 AM

He wanted to know what processor you have.

The first part of your problem, the crash, could have a lot of causes. To help eliminate one pssibility, please provide make/model of memory, mfg part number is best.

The second part of your problem (can't restart PC until capacitors discharge) points to the psu. That is likely the sole cause of the problem. If you can swap in a new one to test, great.

I had an EVGA 680i board and a Tagan 1kw psu that wouldn't work together well. Replaced the psu and a similar problem to yours disappeared. I would have to pull the wall cord and hold in the PC power button until the LEDs on the mobo went out. Then plug it back in, and the PC would boot.

Does your Tagan have a green wire with a screw-hole connector (ground wire) coming off it? If so, is that connected to the case somewhere? Didn't help me . . . just curious.
June 14, 2009 9:22:35 AM

Oh sorry, i forgot to post my processor, it's a AMD X2 5600. Yes, i have the ground wire connected to the buttom of the case.

I fixed the shut down error by removing one of my ram blocks at the time so i was able to get windows installed, but now when i power on the pc and get to the Windows Loading screen i get a BSOD with "Unmountable_Boot_Volume" error, and i still have to keep pulling out the cord and turning the switch on and pff until it will start but it doesnt shut down without error anymore


June 14, 2009 9:59:27 AM

Oh sorry, i forgot to post my processor, it's a AMD X2 5600. Yes, i have the ground wire connected to the buttom of the case.

I fixed the shut down error by removing one of my ram blocks at the time so i was able to get windows installed, but now when i power on the pc and get to the Windows Loading screen i get a BSOD with "Unmountable_Boot_Volume" error, and i still have to keep pulling out the cord and turning the switch on and pff until it will start but it doesnt shut down without error anymore


a b B Homebuilt system
June 14, 2009 10:13:11 AM

wait by shutdown issues you mean it resets? or just cuts out?

if it resets/blacks out go into the bios and set everything MANUALLY - auto = BS these days, set that ram back to 667 @ 1.9v and see what effect that has
June 14, 2009 10:46:18 AM

Okay, removing them RAM didn't help as i thought. I was just lucky that the installation didn't shut down on me until i got windows installed. Now when i boot up and gets to the windows logo screen the pc shuts down after a few seconds. I've tried to run repair but the PC shuts down as soon as i enter the console recovery screen.

Thanks to everyone who are helping me out, the big school project is tommorow and i'm screwed if i don't get it up and working.
June 14, 2009 11:01:57 AM

Okay, removing them RAM didn't help as i thought. I was just lucky that the installation didn't shut down on me until i got windows installed. Now when i boot up and gets to the windows logo screen the pc shuts down after a few seconds. I've tried to run repair but the PC shuts down as soon as i enter the console recovery screen.

Thanks to everyone who are helping me out, the big school project is tommorow and i'm screwed if i don't get it up and working.
June 14, 2009 12:57:05 PM

this kind of thing happened to my laptop when i was stuppid enough to open the processor/ram bay and wanted to see the cpu so i unscrewed the heatsink and the i forgot to completely screw one of them in. it would only get to the desktop and the completely *** down. i tried installing linux(ubuntu) and right before it shut down it told something like CRITICAL TEMPERATURE REACHED (85C) so then i realized what the problem was. are you completely sure that its not the same type of problem? btw good luck on your project :) 
June 14, 2009 1:25:52 PM

yes im 100% sure it's not heat related, i even have a seperate air fan blowing into the pc from the side
a b B Homebuilt system
June 15, 2009 1:53:34 AM

You haven't answered the questions beyond the first sentence of the post, so its hard to help.

It's prolly the psu, and in any case you're prolly screwed on the project unless you beg or borrow another one to try in there, or borrow a PC.
a b B Homebuilt system
June 15, 2009 2:00:26 AM

My first feeling is that your power supply is bad, so if you can swap it for another, that's your best bet I think. If you check though, most colleges have a library or something you will be able to use for your project.
August 26, 2009 1:47:28 PM

i experienced that kind of problem on my intel p4 pc...before it reach the welcome screen..it shuts down.. the only solution that seems to work on my case is when i removed the processor from the mobo, thoroughly cleaned the contact points.
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