The fan on my power supply gave out and caused an over-heat shutdown. I allowed the system to cool down for 30 minutes with the cover off. I powered back up and everything worked fine and I worked for about 15 minutes.
I replaced the powersupply with a new one and now at boot up I get regular long beeps from the motherboard buzzer and no movement on the system. I went back in and unplugged all drives except for the boot drive and still nothing changes. I did check to see that all boards, memory and power cable are seated properly.
I reinstalled the original powersupply which is giving me the same error now.
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OverheatingWhen the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
It can happen in several cases. Like:1. If your processors cooling fan does not run properly or stops running , your processor gets over heated and will automatically shutdown to prevent damage of your motherboard. In this case check this first, If is runs but not seem so smooth, just clean it- dust can jam the cooling fan.
2.If your heat sink under the cooling fan is not perfectly fit on the processor, cooling fan will not able to cool it and will result your machine shutdown!
3. In case of Bad power supply, it can also happen. Check your power supply.
4.If your machine have defected RAM or became defected, it may happen. In this case you may have blue screen with message before shutdown your machine.
5. If you have operating system of Microsoft Windows, please check your hard drive for virus. Virus can shutdown machine with a common period of time! Damaged OS which occurs often in windows operating system also can force to shutdown machine. Please check which one is in your case. Please mention problem details like something unfamiliar for further query.
It may not be the power supply. When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail. A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust. Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a small brush and can of compressed airto do this.
Turn the computer off.
Remove the side-panel, to expose the motherboard.
Turn the computer on.
When you see PRESS <blah> TO ENTER BIOS SETUP, press the <blah> key.
Use the "arrow" keys to move around the BIOS SETUP menu,
looking for any "system health" menu-entry.
Press the "enter" key to select that menu-entry.
It should report the current motherboard temperature, and the current CPU temperature,
and the temperature-limit, beyond which the motherboard will force a shutdown.
It may also report the speed of the power-supply fan, the case fan (if installed), and the CPU fan.
Also, take a look at the fans, to confirm that they are spinning.
Replace any non-functioning fans.
The power supply would have been my 2nd option too. It can build up quite a bit of dust which gets very hot inside and overheats. Good thing power supplies are cheap. I assume since you cleaned the heatsink area that your fan is working and plugged in. A bigger fan might be needed too.