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Help with random shutdowns

Markbnj

Elite Member <br>Moderator Emeritus
Moderator
Hey guys, could really use some help with this as the machine in question is my primary development system, and I can't afford to wait and mull over a solution. Some quick decisions will have to be made.

System in question is: MSI K8N Neo4, 4 gigabytes ram, AMD X2 4400+ (939), BFG GTS250 video card, WD Raptor 74 (sys) and 400 gig secondary drive. Running Vista Ultimate fully patched.

Starting about 9:00 last night the system shuts itself off. There is a distinct sound of a relay or other device tripping in the power supply, and everything is dead. To get it back up I need to turn off the rear switch on PS, unplug it, plug it back in, turn the switch back on, and press the button. It seemed like a power supply issue to me, and as I was running a 4 year-old Antec 480 that was on the borderline capacity-wise, I went out today and picked up an Antec 750w at Staples (the only place around that had a PS on a Sunday, and the only brand they carry).

However, after taking everything out, modding the case to fit the new PS, cleaning everything out very well and reassembling, the problem recurred. I then started disconnecting peripherals and removing cards until I was down to the mb, proc, ram, raptor, video card, keyboard, mouse monitor. Same problem. The machine will boot into Vista, and then whether I bother to log in or not within 5 minutes or so, *click*, it shuts down.

Another interesting aspect is that it seems I can boot into the BIOS setting screen and run it all night. At least it has been sitting on the menu for the last 30 mins or so. I was pretty much heading for Newegg to see what deal I could get on a 775 mobo and a C2D/RAM when I realized that it ran fine without booting windows. That kind of points me in the direction of a memory error rather than a mobo problem. Any thoughts or opinions? I'm going to try removing two of the four sticks of ram to see if that makes a difference.
 
sounds like a cpu issue, mobo & cpu, or just the cpu overheating, remove the cpu, clean and reapply thermal compound and retest, if same replace mobo and cpu.
 
Sometimes the shutdown happens while Windows is still loading, thirty seconds or so from power-on. That was the case this morning after the machine sat off all night, so I am skeptical that the CPU is overheating. It has a good heatsink mounted with Arctic Silver, and the temps have been stable for four years. Also, the BIOS reports the CPU temp well within operating range.

I think you're probably right about the motherboard, though. I don't see what else it could be. I ran a full scan with memtest86 and had no errors. I'm in the process of running a diagnostic on the raptor right now to rule that out. Funny thing is I can run memtest and this raptor diagnostic and the machine behaves just fine. It's only after Vista loads that it shuts down. I guess it's not surprising since Vista is using I/O addresses and resources these simple utilities and the BIOS setup are not.

Edit: the raptor scanned out fine. Has to be the CPU or MB, so I guess it's time to upgrade.
 
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