Solved Reboot loop related to overheating?

January 26, 2013 at 09:50:54
Specs: Windows 7, Pentium E5700 3 GHz
Ive been running my system with this configuration error free for about six months:
Asus P5B Deluxe MB, Win7 Pro, 2x2GB 667 DDR (system only detects 3 gb), Pentium E5700 3.0 ghz, PNY Nvidia GEForce 210, 250 gb SATA HD, 250 gb IDE HD, SATA DVDR and IDE DVD/CD-RW drive, with a 400w PS.

Over the week I have started to have the whole system crash and reboot. On reboot the monitor will power on and display the nvidia version text and I get one post beep, then it reboots again. It will loop like this interminably. I have managed at times to get it to through to setup and occassionaly even back into windows by holding the power or reset button a little longer, but eventually it returns to this loop. The PC had seemed to last longer after a night with all power off, but that didn't last. I have tried a different video card and also moved all the components to a different system except the MB and processor, and everything runs fine. I have heard the cpu overheat alarm at times but the temperature of the cpu has never shown more than about 115 degrees F. I have a few times seen a brief "Overclocking failed" message at boot. I have reset the CMOS and the BIOS is the most revent version, even still I reinstalled it also.
I have removed all components, replaced the heatsink and fan, cleaned everything of all dust etc.
I have an outside air intake over the cpu, 3 chassis fans and an additional 90 mm fan mounted inside the case. The processor was part of the upgrade I did 6 months ago, when I installed win7 and added the Nvidia card. Asus' system monitoring software etc, the AI suite is not supported by win7 however.

My main question is whether this type of reboot loop is typical of an overheating cpu, and if so should I risk trying to work on solving the overheat issue in a system with a board this old or save the processor for a different board and call it quits? I really needed this PC to last a few more months until I can completely replace it.

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January 26, 2013 at 11:23:33
Random reboots can be due to overheating, but can also be due to an overburdened power supply. 400W doesn't tell us much, amperage specs are what we'd really need to know, plus the make/model.

To make things easier, please report temps in Celsius. 115F is approx 46C. If that's the temp at idle, it's a bit warm. I just checked my CPU temp (overclocked Phenom II X3) & it's at 30C. And that's with zero case cooling fans. I have an Asus board & use Asus PC Probe II. You can download it here:

You should also confirm your temp readings in the BIOS. Why the overkill with all the fans?

The reason your RAM is only detecting 3GB is probably because you're running Win7 32-bit. It you want to make full use of it, you'll have to install the 64-bit version.

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January 26, 2013 at 14:24:15
Power supply is a Logisys P550A
I used all the fan connects on the motherboard, its an old heavy case I've had for about 10 years. Today I put a working msi video card, another pair of 2x2 ram and a 70 gb IDE hard drive with a copy of WinXp and tried again.

The PC powers up, fans spin for 5 seconds, then one beep and the power cuts, and it starts all over again, nothing on the screen, just this same loop over and over.

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January 26, 2013 at 17:19:14
✔ Best Answer
"Power supply is a Logisys P550A"

There you go, cheap generic crap. Replace it ASAP. There's nothing wrong with getting a low cost PSU if you know what to look for but Logisys ain't it. Read this then look at the Corsair:

"I used all the fan connects on the motherboard"

Like I said, the fans are overkill. Plus if you have them configured wrong, they'll do more harm that good. All that's really needed is a rear exhaust fan plus the PSU fan. Front intake fans are OK but not really necessary. Side panel fans should NOT be used because all they do is disrupt the optimal "in thru the front, out thru the rear" airflow.

How did you apply the thermal paste when you installed the heatsink on your CPU? Proper paste application is critical. Your CPU uses the horizontal line method:

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January 26, 2013 at 19:08:24
Tried the CPU on another pc to make sure it wasn't damaged, checked the board with another PS, sure enough it is the Logisys piece of crap. Ordered an Antec that will be able to move on to my next system so I should be going again by end of week. I've just always assumed that if it worked out of the box, it would be decent enough to last a year or two, not six months. Lesson learned for certain. I had applied the compound in three lines, I am definitely abandoning my "more is better" cooling philosophy.

Thanks for all the help, very much appreciated!

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