PC suddenly shut off, will turn back on

Psirus · October 25th, 2009, 6:19 PM

Ok, I've had a problem with my computer the last week or so.
I had suddenly shut off, just like a power outtage, but the rest of my stuff (monitor, speakers etc.) still worked...
Since it runs just fine for the most part (happened only twice, and my pc is almost always on), i don't suspect the hardware to be wrong, or am I mistaken?
Then again, I've never had any troubles with Ubuntu so far, and I doesn't seem like a normal crash, it's not freezing up or anything, just power cuts out instantly.
Help?

the Interceptor · October 25th, 2009, 6:38 PM

Sounds like CPU or PSU problems. Have you checked temperatures? Are all the fans running? How old is the PSU?

Psirus · October 25th, 2009, 7:25 PM

Sensors seem not to be working under linux, say 30°...
Well, all the fans are running, at least right now.
Air coming from the PSU seems quite warm, yet I don't have any idea if thats really too warm or not.
PSU is probably a year or two old.

Polygon · October 27th, 2009, 5:15 AM

My first suspect would be the power supply, second would be the mother board. Especially if all your temps are in line. If you really want to test the power supply you can buy a good tester for about $20. Other wise you're going to have to replace it to see if the problem persists.

Psirus · October 27th, 2009, 6:35 PM

Fixed it

It was indeed the cpu heating up.
The first sensor program I tried it with didn't work, so after I found one that did work, temperatures were around 75°C for normal stuff, and when I tried to use all the processing power, temperatures climbed to over 100°C in a couple of minutes, and then it shut off again, which proved that theory.
So I opened the case to see whats what.
Fans were all running, as mentioned earlier.
Took the fan and the cooler of the cpu, and the thermal grease looked kind of wonky.
So I went to the next computer store, bought some grease and tada, runs like new.
Normal temperatures around 35°C, never hit more than 55°C during testing.
All is fine

Never thought it would make such a big difference though.
Thanks for all your help.

Polygon · October 27th, 2009, 8:47 PM

Holy crap, over 100° C!

Glad to hear you fixed it and there isn't any permanent damage.

the Interceptor · October 27th, 2009, 9:16 PM

Yeah, good to hear that the problem doesn't persist any longer, and that we pointed to the right directions.

October 25th, 2009, 6:19 PM	#1
Psirus Joined: Dec 15th, 2008 Last Online: 7:18 PM Location: Dresden, Germany Age: 21 Posts: 137 Car: VW Polo Harlekin Rep Power: 9	PC suddenly shut off, will turn back on Ok, I've had a problem with my computer the last week or so. I had suddenly shut off, just like a power outtage, but the rest of my stuff (monitor, speakers etc.) still worked... Since it runs just fine for the most part (happened only twice, and my pc is almost always on), i don't suspect the hardware to be wrong, or am I mistaken? Then again, I've never had any troubles with Ubuntu so far, and I doesn't seem like a normal crash, it's not freezing up or anything, just power cuts out instantly. Help?

October 25th, 2009, 6:38 PM	#2
the Interceptor I LUV MY PRIUS!!! Joined: Feb 22nd, 2005 Last Online: 12:54 PM Location: Germany Posts: 3,518 Car: BMW E36 323i ultraleggera (-143 kg) Rep Power: 108	Sounds like CPU or PSU problems. Have you checked temperatures? Are all the fans running? How old is the PSU? __________________ "We have to laugh at the Germans, because they're so riddled with guilt about their history, they can't laugh at themselves." - Jeremy Clarkson Got a question regarding Hi-Fi of any kind? Then check my general audio thread.

October 27th, 2009, 5:15 AM	#4
Polygon Joined: Oct 7th, 2007 Last Online: 4:18 AM Location: Utah, United States Age: 28 Posts: 331 Car: 1989 LeBaron GTC TII & 1991 Stealth R/T TT Rep Power: 13	My first suspect would be the power supply, second would be the mother board. Especially if all your temps are in line. If you really want to test the power supply you can buy a good tester for about $20. Other wise you're going to have to replace it to see if the problem persists. __________________ Clint: 1989 Chrysler Le Baron GTC Turbo II - 1991 Dodge Stealth R/T TT - 2008 Ford Escape My CarDomain Garage

October 27th, 2009, 8:47 PM	#6
Polygon Joined: Oct 7th, 2007 Last Online: 4:18 AM Location: Utah, United States Age: 28 Posts: 331 Car: 1989 LeBaron GTC TII & 1991 Stealth R/T TT Rep Power: 13	Holy crap, over 100° C! Glad to hear you fixed it and there isn't any permanent damage. __________________ Clint: 1989 Chrysler Le Baron GTC Turbo II - 1991 Dodge Stealth R/T TT - 2008 Ford Escape My CarDomain Garage

October 27th, 2009, 9:16 PM	#7
the Interceptor I LUV MY PRIUS!!! Joined: Feb 22nd, 2005 Last Online: 12:54 PM Location: Germany Posts: 3,518 Car: BMW E36 323i ultraleggera (-143 kg) Rep Power: 108	Yeah, good to hear that the problem doesn't persist any longer, and that we pointed to the right directions. __________________ "We have to laugh at the Germans, because they're so riddled with guilt about their history, they can't laugh at themselves." - Jeremy Clarkson Got a question regarding Hi-Fi of any kind? Then check my general audio thread.

October 25th, 2009, 7:25 PM	#3
Psirus Joined: Dec 15th, 2008 Last Online: 7:18 PM Location: Dresden, Germany Age: 21 Posts: 137 Car: VW Polo Harlekin Rep Power: 9	Sensors seem not to be working under linux, say 30°... Well, all the fans are running, at least right now. Air coming from the PSU seems quite warm, yet I don't have any idea if thats really too warm or not. PSU is probably a year or two old.

October 27th, 2009, 6:35 PM	#5
Psirus Joined: Dec 15th, 2008 Last Online: 7:18 PM Location: Dresden, Germany Age: 21 Posts: 137 Car: VW Polo Harlekin Rep Power: 9	Fixed it It was indeed the cpu heating up. The first sensor program I tried it with didn't work, so after I found one that did work, temperatures were around 75°C for normal stuff, and when I tried to use all the processing power, temperatures climbed to over 100°C in a couple of minutes, and then it shut off again, which proved that theory. So I opened the case to see whats what. Fans were all running, as mentioned earlier. Took the fan and the cooler of the cpu, and the thermal grease looked kind of wonky. So I went to the next computer store, bought some grease and tada, runs like new. Normal temperatures around 35°C, never hit more than 55°C during testing. All is fine Never thought it would make such a big difference though. Thanks for all your help.

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