ASU8S M4A785-M Random shutdown

This is my system:

- Motherboard ASUS M4A785-M
- AMD Phenom 9850 Quad-Core, 2.5 GHz
- Net Realtek PCIe GBE
- HDD WesternDigital Caviar Green 3.5 TB
- ATI Radeon HD4830 512 MB DDR3 (just the card:
- Power Supply: ULTRA ATX 600 watts (more info:
- ULTRA Carbon X3 Multi-socket Heat sink
- OS Win 7 Ultimate 32bit

I've been using this since 2 months ago without complaints, but last week my PC turned off maybe after 1 hour of use, and from then, started to shutdown randomly without any pattern. First I thought it was overheating so i replaced the thermal compound in the GPU and the temp reduced aprox. 10 degrees, I did some tests and the temp was OK. Then i thought the power cable from power supply was damaged but it was working on other systems. Lastly, i made some voltage tests on the power supply but everything seems to be fine, it could be the wattage in my house?, these shutdowns can occur from 3 hours of use or 5 minutes, and sometimes 10 seconds after turning on and then I have to restart the power supply in order to turn it on again. It could be some incompatibility problem between the PSU and the motherboard? I did the last upgrade of ASUS: the 10006 but it didn't help. I would appreciate any advice, thanks.
7 answers Last reply Best Answer
More about asu8s m4a785 random shutdown
  1. bad mobo. had this happen on my old rig. would shut down randomly. it is slowly dying. replace it before you have a paper weight. could cause damage to your psu if it shoots power back too. bad mobo!!!
  2. Thanks casualbuilder!, but there's another thing about the mobo, due to the problems, I replaced the PSU with a costume ATX Extreme 450 watts (this one came with the original barebone kit i bought in CompUSA), but this time without the GPU (because the GPU has a 6pin PCI entrance, and this PSU comes just with a 8pin connection) and since this change, everything works just fine, no more shutdowns anymore. It still could be the mobo?
  3. huh...its a bad power supply then. i changed my mind. if you changed out the psu, then its definately the psu. buy a reputable psu, Corsair, Antec, and Seasonic.
  4. Thanks a lot builder!, then I shipping back this junk to ULTRA. Greetings
  5. Would you recommend me that Corsair HX750W??
  6. Best answer
    YES!!! that is the same unit i use in my build. It is very reliable, and built "Ford Tuff" Voltages are steady, and it keeps my system running in top performance. Very good PSU.
  7. Best answer selected by dan_seven.
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