Burnt smell, PC doesn't turn on, mobo gets energy. Dead CPU? Dead mobo? Both dead?

I'm a newb to these forums and I know only a thing or two about hardware. I apologize if this is in the wrong section.

So, here's what has happened: I was watching a movie, and then I decide to go fetch something on the fridge. As soon as I come back, the PC is off and there's a strong burnt smell. Since I live in Brazil and it is pretty hot over here, I do assume my coolers didn't stand the heatwave and my PC, well, died.

I tried leaving it and trying again, resetting CMOS (via jumper and by taking off the battery) and nothing happens. I've taken the processor out and there's no sign of anything burn in it (I couldn't see any black pins on it). The motherboard's power LED does turn on when I turn on the PSU, but when I hit the power button, nothing happens.

Are there anything else I could try to troubleshoot it? Is the CPU and/or mobo dead?

My motherboard still has a valid warranty, but I don't want to RMA it if it isn't necessary. I don't have a spare mobo or CPU to test it.


Mobo: ASUS Sabertooth 990FX R2.0
CPU: AMD Phenom II X6 1055T @ 2.8Ghz (completely stock)
RAM: 12GB DDR3 1333Mhz
PSU: Sentey 650W
5 answers Last reply
More about burnt smell turn mobo energy dead cpu dead mobo dead
  1. Most likely just the PSU that is burnt, since it is a low cost unit.

    Smell the PSU and see if that is where the smell is coming from. You can even open it and check for burns.
  2. Probably a capacitor on the mobo or inside the power supply.
  3. How much thermal paste was applied to your CPU and were you using the stock cooler?
  4. Hi,

    Usually, it's the power supply, the best way to find out is to test with another power supply.
    From there you should know if something else has been damaged.

    If the motherboard has failed too, you will have to RMA it.
  5. Is it possible that the PSU is dead, even though it does light up the motherboard's LED when I turn the PSU on? I'll try opening it when I get home.

    The smell comes straight from the mobo's socket and the CPU.

    At the time I was using the stock cooler, and there was plenty of thermal paste.
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