PC beeps once upon start up, shuts down, does it over again

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scoobster333

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Oct 11, 2011
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Hi,

My PC starts up for maybe half a second, does a very faint beep and immediately shuts down. It will keep trying to boot up after a bit and it repeats it over and over.

From my understanding the faint beep means it is getting past POST.

I tried removing everything except HSF, CPU, and the PSU. I slowly added more components to it. Almost all of the time, it would always do the same thing - turn on, beep only once, restart. At first I thought it was the PSU since mine is 7 years old but I went and bought a new one and same thing. I haven't been able to access the BIOS since it doesn't stay on long enough.

The weird thing is a couple of the times when I had just the HSF, CPU, PSU attached, it went silent (turned on, no beep, restarted and tried again).

From reading past threads, it seems this is probably a MOBO or CPU issue. Can someone confirm if that's it? Is there any way for me to know which of the two is the problem without having to put in a new CPU? I don't currently have a spare.

(besides the PSU) everything is < 1 year old

Specs:
Mobo: MSI Z97 gaming 5
CPU: Intel i7-4790K
GPU: Nvidia GTX 970
8 GB Ram
1 246 gb ssd and 1 2T hdd
 
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Chicano

Chicano

Judicious
Aug 29, 2011
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The single faint beep half a second after pressing the power button is probably the first beep... the normal checksum beep comes after the BIOS has posted 5-10 or sometimes more seconds. My motherboard does that, one faint beep right after startup and another after the Post. Can you tell if your's normally beeps twice like that?... If you confirm this, it means it is not even posting, this can happen if the CPU is overheating and they can overheat in seconds if the heatsink is not making good contact with the CPU. You said you have not removed the HSF & CPU... and I'd suggest doing that next to check the thermal grease and reapply some if necessary. You should also check the cooler fan is spinning and if at a normal speed.

If the motherboard/BIOS buzzer is beeping, that means both the PSU and the motherboard are working... so it's probably the CPU but possibly from overheating. The single time when it didn't beep may be because the BIOS didn't yet start loading before it crashed.
 
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scoobster333

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Oct 11, 2011
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I don't think my PC normally beeps more than once when it was working, but I can't say for sure. Hard to remember that little of a detail :D

I reapplied thermal glue.. now it doesn't beep at all! Any ideas?
 
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
29
35,490
1. The BIOS would not beep that quickly after startup so it's probably not the completed post beep... but any beep indicates BIOS activity, no beeps indicate the opposite.

2. Does it still shut-down as quickly?.. If so, dead mobo or CPU would not influence shutdowns. So if it now stays on but there is no beep either mobo or cpu is dead.

3. See with the tip of a finger if the heatsink overheats.

4. Have you checked the CPU socket for bent pins?

5. BIOS beeps (either one) indicate the BIOS is working... If the BIOS doesn't beep from now on, could be the motherboard or CPU was in the process of dying and is now dead.

6. With a dead CPU the mobo would also not beep.. but if the CPU has not suffered overheating or shortcircuited, it would be more likely the mobo is dead.
http://www.tomshardware.com/forum/288065-30-power-motherboard
 
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