Random Reboots.

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'
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
andyw27Author Commented:

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

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
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

andyw27Author Commented:

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 ?
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.
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...
>>>    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?
andyw27Author Commented:

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
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...
andyw27Author Commented:

Its a brand new Freecom ready made one, FD3 160 gig
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.
Just a thought here.  Some viruses cause spontanious rebooting.  Sasser.B for example.  I have also seen rebooting caused by a bad power supply.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.