onyx550

I have a home built system, and enough knowledge to make me dangerous in the system building world. I have an unusual problem though at the moment that's got me rather stumped. About 2 months ago, my PC started shutting down randomly and without warning. only seems to happen when running a particular game. Now, i've tried reinstalling the game, no help. Tried formatting the drive, comp seemed to run fine for 2-3 days then the problem returned. So all the drivers i have for all my hardware are very new. Finally figured the problem was over my head, and decided to take it to a shop and get a professional opinion. Among other things, i told him i'd checked all the ram, got the same shut down with each stick individually installed, ran a registry cleaner, scanned for virus' all came up clean. So i'm thinking it's over heating, put a 120mm case fan to blow right on the processor and ram, same problem still. The shop had the computer for about a week, when they finally called their opinion was the GPU. So, i pulled out the ATI 1650X gpu that was installed and put in a nice new Nvidia 9600GT. Here i am, 4 days after getting it back from the shop and putting in the new GPU, which is awsome, and i'm still getting the same random shutdowns. Also, about 3 months ago, my original power supply went out, so i put in a new 750w power supply. The shop tested that as well and said it was fine. So, i'm now officially out of ideas, aside from the CPU overheating, or the motherboard taking a dump on me, i'm completely lost on this one.

manic

What brand and wattage power supply?

onyx550

Logisys 750w, probably going to get a BFG tech 800 here shortly though

manic

What are your temps like? If you go into bios under hardware
monitor it will give you idle temps,it will also give you voltages,
take a look at both temps and voltages and post back, granted they
are idle temps, and voltages but may give us a idea. You can install
speedfan, or motherboard monitor and it will monitor temps while
system is under load, I lke speedfan for that. Might be heat, or
it could just be something flakey with the board. The power supply
you have not is probably ok, dont buy a bfg, buy a corsair or seasonic,
do some reading about power supplies in the hardware section of this
forum. Stay away from antec, they used to be real good, but have
switched suppliers, and the quality has faded.

minster9

I installed an aftermarket temp monitor in my case when I built mine cpl yrs ago. It's got 3 separate temp probes you tape to what you want to monitor. Usually graphics card,cpu,& hd. Runs off ps,fan speed adjustable. If you have an iffy mobo,how can you trust how hot it's telling you it is?

onyx550

Put in a new power supply today, corsair 520, speedfan is telling me i have these temps now with the new PS installed.:

System: 32c
CPU: 54c (high)
Aux:49c
HDD:40c
Core: 54c
Core: 48c

CPU fan: 1241 rpm

VCore: 1.36V
+12v: 12.14v
AVcc: 3.31v
These temps are after loading of install on SP3 for XP

Seems to me the cpu is a bit on the high side. Fan is probably a year and a half old, so it's probably time to change it is what i'm thinking.

No load, stabilized 10 minutes:

System: 32c
CPU: 46c
Aux: 48c
HDD: 38c
Core: 46c
Core: 47c

CPU fan:

VCore: 1.36V
+12v: 12.14v
AVcc: 3.31v

wrench97

Redo the thermal paste on the CPU> http://www.arcticsilver.com/arctic_s...structions.htm