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PC Mobo issue?

pricerpricer Registered User regular
Having just ordered and installed a new mobo (M5A99X Evo) and CPU (Phenom II), it ran perfectly, the first time I switched it on - no BIOS issues etc, just straight into Windows. Though as of last night, when I powered it up, the CPU light on the mobo came on, and it wouldn't even get to the BIOS - and it just idle'd.

After powering everything down, and powering it up, it then ran fine - booted upto Windows etc, no signs of any issue - but as soon as I shut it down, it won't boot up. After further investigation, I can reboot fine - but sleep will produce CPU light/idle'ing issue.

This pattern has continued, even after stripping everything down, including re-seating the CPU. My thinking is, that if I can boot into Windows, and utilize everything perfectly, then the mobo CPU light is a red-herring. Though should I consider anything else before I RMA the mobo? Any way to verify it's the mobo and nothing else?

Key Specs:
AMD Phenom II X6 Black Edition 1090T 3.2GHz
Asus M5A99X Evo
G-Skill 8GB (2x4GB) DDR3 1600Mhz
850W BeQuiet Modular BN075 PSU

Additionally, I am powering the mobo from both the 24-pin and 8-pin ATX power connectors, and only using a single graphics card (Radeon HD 6800), so I'd like to think my existing 850W PSU is more than enough here.

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    TychoCelchuuuTychoCelchuuu PIGEON Registered User regular
    You could try resetting the CMOS and if there's an updated BIOS flash to that. Sleep issues can be weird. I fixed one on my computer by installing the Intel Rapid Storage driver.

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    pricerpricer Registered User regular
    Forgot this was here; anyway it was actually the PSU, though specifically the 12v rail - ended up replacing the PSU and has been fine ever since. Still confused why there was no PSU failsafe along the lines of "well, if the 12v rail is faulty, then i'm not starting up at all", but case closed.

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