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Computer boots up but shuts off


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13 replies to this topic

#1 robert1957

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Posted 22 October 2009 - 11:25 AM

Not sure if this where to post but if you move it I'll never find it
I turn on my computer, it boots up, get windows, then desktop then it shut down.
Tried to run in safe mode still shuts off
Amount of time it runs is random and not consistent
It will shut down before my monitor gets a chance to start.
Power supply was replaced with no change.
Any ideas or fixes
Can't run any fix programs as it keeps shutting off
Thanks in advance
Rob

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#2 hamluis

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Posted 22 October 2009 - 12:14 PM

I would suspect hardware...first (in this case).

No error messages of any sort?

System manufacturer and model?

Why did you change the PSU?

Have you checked any other hardware items (RAM, hard drive, etc.)?

Louis

#3 robert1957

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Posted 22 October 2009 - 09:34 PM

No error notices
This is a clone so would have to open and look at each piece to see what this is.
I changed the PSU just ona wim.
But have not looked anywhere else
Not to knowledgable at all so this is why I'm here
Rob

#4 AustrAlien

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Posted 22 October 2009 - 10:53 PM

The CPU is overheating by the sound of it.
Check that the fan is working and the heatsink is clean.
You may need to remove the heatsink and apply new thermal paste.
--------------------

CPU overheating causes a system to turn off immediately, with no error message, usually by default at 70C.
You may be able to check CPU temp in the BIOS Setup Menu, in Hardware Monitor.
Use something like Speedfan http://majorgeeks.com/SpeedFan_d337.html
to monitor the CPU temperature, and if you see temps in excess of 50C, then you may have cause for concern, and if temps approach 70C, then you have a problem.

Other tools:
Everest:http://majorgeeks.com/download4181.html
Motherboard Monitor: http://majorgeeks.com/download.php?det=311

A quick way to test this is to download and run toast.exe http://majorgeeks.com/Toast_d867.html
This will run the CPU at 100%. If you can run this for 20 minutes without any problem, then your CPU cooling system is fine.

If the thermal paste contact between the CPU and the heatsink is broken, temps may appear to be "normal", under most conditions. However, when the CPU is heavily utilised, the temps can spike upward sharply, causing the system to turn off.
-------------------

Please let us know what temperatures are reported, under what conditions, and using what method.
AustrAlien
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#5 robert1957

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Posted 24 October 2009 - 03:42 PM

Wish this would be it be but the system doesnt run for more than about 30 to 45 secs before shutting down. So don't feel overheating is an issue. Tried changing ram but not diff. When I do go to cmos it will stay running but as soon as I exit and it goes to windows it shuts down. I have a felling that this is a progrming problem, maybe a virus I picked up. Running PC cillian 2009 with regular updates, as anti virus but have noticed it does not always catch everything.

#6 robert1957

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Posted 24 October 2009 - 03:44 PM

Sorry if my answers seem lame but have no real clue with computers. But gotta/gonna learn.
Rob

Edited by robert1957, 24 October 2009 - 04:22 PM.


#7 AustrAlien

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Posted 24 October 2009 - 03:46 PM

You may be able to check CPU temp in the BIOS Setup Menu, in Hardware Monitor.
Please let us know what temperatures are reported

Please check for temperature in BIOS

You said: "the system doesnt run for more than about 30 to 45 secs before shutting down"
Yes, it IS likely to be an overheating problem!

Edited by AustrAlien, 24 October 2009 - 03:47 PM.

AustrAlien
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#8 robert1957

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Posted 24 October 2009 - 04:07 PM

Just found out it does shut down in cmos but lasts a little longer.
Found harware monitor but shut off before I could get in
The bracket that holds the fan to the heat sink is broken
This would also help hold the sink which I found is also loose.
Removed it a blew out any dust but there wasn't much.
will let it sit for a sec as when I tried to refire it up it shut off immed
Rob

Thanks for your help

#9 robert1957

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Posted 24 October 2009 - 04:13 PM

Yehaw, Temp running at 70c when started and climed to 87c.
Applied a bit of pressure to fan unit and temp lowered to 82.
I tried to run windows but gave me a fault of CPU fan failure and then shut down.

#10 AustrAlien

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Posted 24 October 2009 - 04:23 PM

Good: You have found the problem.

Arctic Silver
http://www.arcticsilver.com/as5.htm
Go to "Instructions"

How To Correctly Apply Thermal Grease
http://www.hardwaresecrets.com/article/274
AustrAlien
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#11 robert1957

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Posted 24 October 2009 - 06:03 PM

Let me break this down here:
New fan and sink bracket 10.00
heat sink paste 10.00
Isopropyl 5.00
Total 25.00

Computer Shop visit would have cost 50.00 just to look at it.

Look on daughter's face when she sees she hasn't lost her 600 odd saved songs................priceless

It has been running for 15 minutes CPU temp steady at 35c

Thank you very much for all your help and time and with putting up with a new guy.
This was really appreciated.
I can't thank you enough
Rob

1 down 2 to go.

Edited by robert1957, 24 October 2009 - 06:04 PM.


#12 AustrAlien

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Posted 25 October 2009 - 01:38 AM

It has been running for 15 minutes CPU temp steady at 35c
Thank you very much for all your help and time and with putting up with a new guy.
This was really appreciated.
I can't thank you enough

My pleasure ... and hey, you weren't too bad for "a new guy"!
Pleased to see you got the problem rectified quickly and without too much fuss.
Maybe we will get to do it again sometime?

Take care, and good luck.
AustrAlien
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#13 joseibarra

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Posted 25 October 2009 - 06:53 AM

Good job!

Need CPU heat sink repairs = call robert1957

Curious:

Yehaw, Temp running at 70c when started and climed to 87c.
Applied a bit of pressure to fan unit and temp lowered to 82.
I tried to run windows but gave me a fault of CPU fan failure and then shut down.


How did you obtain these numbers? Was it from looking in the BIOS/CMOS configuration screens (as long as it would last)?

When/how did you see the fault of CPU fan failure?

The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates.


#14 robert1957

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Posted 25 October 2009 - 10:22 AM

As led to, I went to cmos set up menu and went down to hardware monitor.
This showed me the CPU temp was running to high.
When I pressed abit in the fan assembly the temp did begin to lower but when I pressed save and exit to get out of Cmos it came up with CPU Fan not working and shut down. First time I had seen it was then. I didn't believe it could be an overheat problem cause it only ran 30 secs but got proved and shown I was wrong. Don't question if you don't know just do as you are told.
And as instructed, the heat sink may be loose and upon inspection I did find it loose and the fan and Sink bracket broken.
I quickly ran to the closest Computer Repair and Parts store and got a new bracket and Heat Sink Paste, cleaned off the old paste with alcohol as instructed.
I was worried as I had to removed the mainboard to get to the other side to apply the fan bracket base but took pictures of cables with my camera as I pulled it apart. It went back together easy and only referenced the pics once.
Put new paste on CPU and applied heatsink and clipped into place.
Crossed my fingers and plugged it back in and press the button.
Went right to cmos setup menu and hardware monitor and again watched the temp setting.
I knew she was done when I saw the temps were less than half of what it was..........
Couldn't have done it without the help I received from here.
Thanks
Rob




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