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Random Reboots.

Posted on 2004-11-12
Medium Priority
Last Modified: 2010-04-26
I recently built a new PC around a Koolance water-cooled case.

For a over a month now it has been running fine, however now all of a sudden it has started to reboot at random for no apparent reason, I can be using it for 4 hours and it will restart or it could be 10 minutes.

Here is the spec of PC:

      Intel P4 3.4
      ASUS P5AD2 Premium
      ASUS X800 PCIe
      PC Power and Cooling Turbo Cool 510
      1 x 1 gig stick of crucial PC 4200 DDR2 RAM
      2 36gig raptors drive configured on Intel RAID 0
      XP Pro

As I mentioned before the system is water cooled, that includes the CPU, graphics chip and hdd.

At first I though the culprit was something overheating was causing the system reboot, however the system does always reboot under heavy loads, just before it rebooted yesterday the CPU was at 28c and the motherboard was at 45c.

Last night however I though I had cracked it as I removing an external hdd I recently added.  The reason for this is that this hdd required an external power supply and at the moment I have one wall socket with a six way extension bar coming out of it all of which I utilised by various computer products. My reasoning behind this was perhaps the demand for power was out stripping supply.

I then left it on over night but alas it still rebooted.

The only other problem I’ve been getting it is that if the USB card reader is plugged in the system will sometimes not boot fully, not sure if this is related or not.

I’m really looking for any tests that I can do which will prove that a component is faulty, as stripping this system down when it’s full of water is no easy task.

Oh yes, all overclocking has been removed, the system is running as 'standard'
Question by:andyw27
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LVL 93

Accepted Solution

nobus earned 2000 total points
ID: 12563436
You can start with testing your RAm, or swapping it, or running with 1 stick at a time
Test :   http://www.memtest.org/

for the rest, you can go 2 ways to diagnose : hard or soft
Soft : disable everything at startup in msconfig : start>run, type msconfig + enter
select the startup tab, click disable all
select the services tab, click hide microsoft services, clik disable all
reboot, and add on till you have the culprit

Hard : disconnect or disable everything not neede for troubleshooting, so start with a minimum: 1ram stick, kbd+ mouse, video card, 1 harddisk
if the provblem is gone, you can add on devices till you find the bad guy

i suppose the interior of your system is dust free, but check if all fans are running, and try with another power supply

Author Comment

ID: 12563565

Thanks, out of interest would you say 45c for the motherboard is too high ?

LVL 93

Expert Comment

ID: 12563708
45C is rather high, but that depends on the room temp also.
did you cool the chipset chips also? they can run hot too, and are often overlooked
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Author Comment

ID: 12563894

No the chipset chips are not cooled.

In fact there is no air cooling within the case.

I can add a few fans see if that makes a difference, however if the problem is heat related would'nt that have been apparant from the first time it was switched on ?
LVL 93

Expert Comment

ID: 12564006
Then it is a good idea to use 1 or 2 case fans, 1 front, and 1 at the back, so that the first one takes the air in, and the other pushes it out, creating an air stream through the case.

Expert Comment

ID: 12580739
Does your whole computer reboot or does it seem like it's still turned on just the video in a way reboots? Which hd is set as master? your internal or external.... this could be happening due to static shock, which hds are very sensitive to...
LVL 93

Expert Comment

ID: 12581773
>>>    however if the problem is heat related would'nt that have been apparant from the first time it was switched on ?   <<<  not necessarily, you can have bad contacts that develop over the years, with heating and cooling of all the parts, causing expansion and crimp.

did you try the Soft way yet?

Author Comment

ID: 12581909

Okay thanks for the idea's.

I've ordered a new water cooling block for the motherboard so I'll plumb that into the system when it arrives and also a few case fans.

I'm hoping that'll sort it


As for the hdd the RAID 0 is set to primary

Expert Comment

ID: 12589604
Is the external hd a real one or just one that you made external due to not haveing enough power? If so try taking a screw driver ect... and tapping it on the bottom part of you hd while it's turned on.... you should hear it make a clicking like sound this means it got a static charge and reboot...

Author Comment

ID: 12591251

Its a brand new Freecom ready made one, FD3 160 gig
LVL 93

Expert Comment

ID: 12591412
Regarding the usb card reader, you can check the device manager for conflicts  or delete the device in device manager and reboot; you can even delete all usb entries there and reboot.

Expert Comment

ID: 12597925
Just a thought here.  Some viruses cause spontanious rebooting.  Sasser.B for example.  I have also seen rebooting caused by a bad power supply.

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