Solved Help! Just built a new pc & it reboots when under load

July 29, 2012 at 08:15:04
Specs: Windows 7, AMD FX-8120 Zambez /4 gb ram 1333
Hope I can get this typed before it happens again. Just built a new desktop PC. Have been building them for about 8 years. Probably built 30-40 of them. It will reboot when under a load. (running multiple programs at once. No gaming just surfing, listing to music. Nothing heavy. Bought all parts from Newegg except ram which came from local Intrex computers. At first I thought it was the motherboard so I returned it to Newegg and got a different brand. I thought that fixed the problem because I was able to get OS loaded, but then it started again. At first I thought it might be a temp. problem (8 core processor) re-seated heatsink, left cover off turned up fans to max. Watching temps in sidebar program and max is only 32C under full load.
OS: Windows 7 Professional

BIOSTAR A880GZ AM3+ AMD 880G HDMI SATA 6Gb/s Micro ATX AMD Motherboard
AM3+ /CPU Type FX / Phenom II / Athlon II / Sempron 100 Series
FSB 2600MHz Hyper Transport (5200 MT/s)
Chipsets: North Bridge, AMD 880G, South Bridge, AMD SB850
Number of Memory Slots: 2×240pin /Memory Standard: DDR3 800/1066/1333(supportted by CPU model)/1600(OC)/1866(OC)
Maximum Memory Supported 8GB
Storage Devices: SATA 6Gb/s
Onboard Video Chipset: ATI Radeon HD 4250
Onboard Audio:Realtek ALC662
Form Factor
Micro ATX
Maximum CPU TDP (Thermal Design Power) : 125Watt
Socket AM3+

AMD FX-8120 Zambezi 3.1GHz Socket AM3+ 125W Eight-Core Desktop Processor

Hard Drive:
OCZ Vertex 3 VTX3-25SAT3-120G 2.5" 120GB SATA III MLC Internal Solid State Drive

DVD Drive:

Antec CAS-302
1 x 120mm case fan included in rear of case
1 x 140mm fan included in top of case
Power Supply:
Antec EarthWatts Green EA-380D Green 380W Continuous power ATX12V v2.3

Problem: Reboots when cpu is put under slightest load or when running cpu calculation test. Does fine when running Stability or FPU test.
Sometimes it just freezes and the screen becomes fuzzy with red, blue & yellow lines.

While ideling cpu is at 1% usuage and memory usage is at 31%. Temp. 19C under load it gets up to max 32C.
Motherboard bios has been updated to latest 2-8-12
Tried changing almost every setting in bios with no change. Currently in default setting.
Windows will boot fine and you can surf and maybe play music but that is all. Anything else will cause reboot.

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July 29, 2012 at 08:24:41
Sounds like it's time to test the power supply. Failing that, I'd suspect the processor.

EDIT: Could also be the video card, but if you're using one-board video, it'd mean you got two bad MB's in a row.

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July 29, 2012 at 08:25:33
✔ Best Answer
Test your RAM with memtest86+.
Disable the auto-restart feature so that an error message is displayed.

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July 29, 2012 at 10:52:17
The power supply is about 18 months old and along with the case & cd/dvd are out of a computer I was using that got an upgrade. I am beginning to suspect the processor also. I have always been a AMD fan but I have found a lot of complaints about these processors.

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Related Solutions

July 29, 2012 at 10:56:17
Just got back from B. Buy and replaced the ram with PNY 4GB DDR3 PC#-10666 (1033 or 1066 MHZ). I ran the AMD Overdrive Calculation test and it ran for about a minute so I stopped it and included the Stability & FPU test, which also ran for about 90 sec. and boom the computer crashed. I am beginning to suspect the processor . I have always been a AMD fan but I have found a lot of complaints about these processors.

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July 29, 2012 at 11:12:59
You remembered to user thermal compound, right? :-/

If builders built buildings like programmers wrote programs, then the first woodpecker that came along would destroy civilization.

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July 29, 2012 at 13:26:21
Yes, even took the fan & heat sink back off this morning and cleaned and reapplied the compound.

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July 29, 2012 at 13:42:55
Tiny dot of paste, center of the CPU, & NOT spread around like frosting? In other words, THIS, not THIS.

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July 29, 2012 at 15:03:39
OK, after replacing the ram I tweaked a few settings in the bios and it ran AMD Overdrive Calculation test including the Stability & FPU test for a whole hour and no restart. It has now been running without reboot for about 3 hours. Everything got better starting with the purchase of a name brand ram. Let's see how it does over the next 24 hrs. and I will post the bios settings.
Thanks everyone!!

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July 30, 2012 at 17:18:48
Problem fixed!! It has to be the ram. Once I replaced it things have been much better. I did tweak a couple of settings in the bios 1: Fan control setting to aggressive (this processor is known for heat problems) 2: In Advanced settings core performance boost is disabled. I have never had a problem with any ram modules before but I guess their is a first time for everything! Note to self: Buy name brand components that have a known track record! Running 30+ hours straight - no reboots!!

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