instant shut down for no apparent reason????

buachille

buachille

buachille

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Joined
28 Dec 2004
Posts
757
sometimes, especially when i first boot my machine, it shuts down again. not a bsod or a proper shut down, but an instant power off, just like i had taken the plug out of the wall.

it doesn't happen often and when i restart the machine again it will start up and run fine. and the machine will stay on for hours with no problems.

i've checked my temps and they are fine (see nv monitor and speedfan images below)

1.jpg


speedfan.jpg


anybody got any ideas what could be causing this??
 
Whats ya rig spec... include ya PSU?
Click to expand...

i see what your thinking (i think) but i reckon the psu has got plenty grunt.

here is everything.


Thermaltake Tsunami Black Case Inc Windowed Side Panel No PSU

Akasa Ultra Quiet 650W Power+ iQ Active PFC ATX2.01 PSU

Intel Core 2 Quadro Extreme Edition QX6700 "LGA775 Kentsfield" 2.66GHz (1066FSB)

EVGA nForce 680 (Socket 775) PCI-Express DDR2 Motherboard

Corsair 2GB DDR2 XMS2-6400C4 TwinX (2x1GB)

BFG GeForce 7800 GT OC 256MB GDDR3 VIVO TV-Out/Dual DVI (PCI-Express) - Retail (GX-010-BG)

Western Digrtal Caviar SE16 500GB 5000KS SATA-II 16MB Cache - OEM (HD-075-WD

Western Digital Caviar SE 80GB SATA150 7200rpm 8mb

PIONEER DVD-RW DVR-107D

Plextor PX-716SA 16x dual layer

Dell UltraSharp™ 2007WFP 20.1" Widescreen LCD Flat Panel Monitor. 300 cd/m² brightness, 800:1 contrast, 16ms response time.

Mitsumi OEM Black Internal Floppy Drive 1.44mb 3.5 Inchs
 
well i can't find it on akasas website to get that info unfortunately, but here is all the info from ocuk.

Power+ iQ is a development from the award winning PowerPlus range, available as 550W or 650W. Four 12v rails enable optimised safe power distribution. Two 6-pin PCI-e connectors are installed to power the latest dual Graphics systems. Multi CPU motherboards are supported. Designed for all hi-performance desktop systems, Intel Xeon and AMD Opterons. Auto thermal dual fans using a ‘straight through airflow' design provides exceptional cooling. A Sanyo Denki 8cm fan ensures efficiency and long life. Full safety approvals and four levels of electrical protection.

- nVidia SLI certified
- Full range 650W (710W peak) ATX 12V 2.01 & EPS 12V
- 4 x 12V rails giving safe optimised power distribution
- Dual PCI-e connectors
- 24 pins EPS connector with detachable 4-pins for ATX version
- Active PFC with 96% efficiency
- 80mm 2 ball bearing long life Sanyo Denki fan
- Efficient twin fan cooling with ‘straight through air flow’ design
- Built-in bronze heatsink enhancing heat dissipation
- Anti corrosive satin black coating
- UL 240VA safety approval
- Full safety approvals and protection
 
ii think your heatsink needs re seating due to it being 51 on idle.. if it gets too hot it will shut down... run orthos see what temp the cpu gets too... also try coretemp it has a logger so it could prove the temps is your problem
 
I agree with paul_64l, the temp of the processor to be at 51 when idle to me seems extreamly high. I had the same problem with my parents old machine, it would just out of the blue restart itself. It was due to the CPU being to hot, overheating if you like. The cause of the problem was the heatsink and fan were clogged up with an unbelivable amount of dust! Im not sayin that yours is clogged up but maybe not fixed right etc. check it out because i think thats probably your problem.

Gary
 
I would agree with the above suggestions, but I would also say the PSU might be faulty. You can't always trust software voltage readings, but that 12v rail looks worrying.
 
Instant shutdowns apart from the more usual PSU cause can sometimes be down to a short or poor connection somewhere. I'd reseat everything, cables and components alike. Also check for any loose metal items in the case that could be touching the mobo.

Sounds more like a power issue though i must say.
 
If that 12v rail reading is correct then I'm surprised that it even powers up. Check the 12v rail in the BIOS and see what it reports.
 
If that 12v rail reading is correct then I'm surprised that it even powers up. Check the 12v rail in the BIOS and see what it reports.
Click to expand...

well i would but after i reseated the cpu the machine refused to boot. i've been through all kinds of steps to try to fix it but have now resorted to full reinstall of windows :rolleyes:

another thread on this in general hardware.

anyway, could you tell me what this 12v rail reading is. i see a voltage reading in the speed fan image. is that what you are referring to? sorry but i know bugger all about psu's.

is the voltage too high, low, or what?
 
buachille said:
anyway, could you tell me what this 12v rail reading is. i see a voltage reading in the speed fan image. is that what you are referring to? sorry but i know bugger all about psu's.

is the voltage too high, low, or what?
Click to expand...

It's the one at the bottom that's reading 9.87v. It should be as close to 12v as possible, although a little bit either way is fine. Yours is waaaay too low and could be the cause of the problem. However, you can't really trust software readings completely - it might be fine......but it's a bit of a coincidence. You might wanna look in the "PC Health" section of your BIOS - that might give a more accurate reading, but really you need a proper multimeter to plug the PSU in to test it. Your local PC repair shop can do it - or you can just buy one yourself.

I would definitely check that out first.
 
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