i750 overclock, fan failure won't boot HELP!

[history]

Hello,

I am completely baffled as to what is going on with my computer. I have overclocked my processor i5 750 to 4ghz, which had been 99 percent stable for about a week at 1.300 volts, but was giving me a random error on prime 95 so i boosted the voltage to 1.3065 cpu voltage, and began a prime95 test.

I sat near the comp for about 10 minutes, monitored the cpu temp with speedfan (which was sitting around 81 c) and left the room for about 10 minutes. When i came back my room stank like overheating electronics and my computer was off!

It will now not boot, I have removed all usb and other devices from it, as well as slowly removed the ram, video card, basically everything except for the processor, cpu cooler and the motherboard. Still no boot. I finally removed the cpu fan, which I found to stink like the smell I was smelling in the room when I first came back. I have a feeling that my fan crapped out on me while stress testing! /facepalm

So, my question is, is the cpu or motherboard toast and therefore that is why it is not booting, or does my gigabyte p55 ud3 need a functioning 4 pin cpu fan connected in order to boot (as a 3 pin case fan I tried in the cpufan slot doesn't seem to help it boot), kind of like a bios safety feature? It seems that the motherboard is at least seemingly functioning, as I get led signals from my usb devices when the psu is powered on, and i can tell that the motherboard is attempting to spin the fans for a split second when i press the power button after first turning on the psu, but after this there is no signal whatsover from the computer when i repress the front power button. If I turn the psu off and on in the back, once again the first time i press the power button the front of the comp it tries to boot for a split second. Any help would be most welcome. Thanks!

 

[Plimogz]

Ouch.

The board shouldn't have an issue Posting on account of there not being a fan connected.

I'd start by testing the cpu in another board, though I don't know if you happen to have access to another one. FWIW thermal protection ought to have kicked in and saved the day.

Good luck.

 

[history]

Ouch.

The board shouldn't have an issue Posting on account of there not being a fan connected.

I'd start by testing the cpu in another board, though I don't know if you happen to have access to another one. FWIW thermal protection ought to have kicked in and saved the day.

Good luck.

Thanks for your response! Might you know at what temperature thermal protection should have kicked in?

 

[MyLeftNut]

Power off psu and unplug cord, then take out that cmos battery and jumper the board to clear cmos for like 10-15 mins and try again. See if it'll power on then.

 

[MyLeftNut]

Also, if your motherboard has a post code indicator, check the code up and see what it means. That might help in finding out why it doesn't start.

 

[Rifter]

what PSU and GPU are you running? And what heatsink?

 

[Rubycon]

If you smelled something burning a part has released "the magic smoke" and needs replacement. Inspect the motherboard carefully looking for dark spots, burn marks especially around the CPU area. Use your nose once you've been away for an hour or more.

Check the PSU as well. CPU failures are rare even if the fan stops. The CPU will throttle.

 

[Tsavo]

If you smelled something burning a part has released "the magic smoke" and needs replacement. Inspect the motherboard carefully looking for dark spots, burn marks especially around the CPU area. Use your nose once you've been away for an hour or more.

Check the PSU as well. CPU failures are rare even if the fan stops. The CPU will throttle.

That's not smoke. It is High Resolution Gaseous Transistor Lubricant.

Everyone knows this. Except for you.

 

[history]

what PSU and GPU are you running? And what heatsink?

Thanks for your comments everyone. I am running an OXZ600MXSP as well as a Palit 250 GTS with Accelero S1 rev 2 cooler. The heatsink is a Corsair H50 cooler (it's this corsair fan that stinks). I will try popping out the battery and do a cmos clear and report back. Thanks everyone!

 

[pcgeek11]

I'd say the Motherboard first or PSU second ... I agree the CPU would have throttled down to protect itself. If you smelled " that special smell ". Somthing is toasted.

 

[history]

I'd say the Motherboard first or PSU second ... I agree the CPU would have throttled down to protect itself. If you smelled " that special smell ". Somthing is toasted.

Thanks a lot for your response! What might have toasted the psu? Was my stress testing too much?

Also, how might overclocking the cpu damage my motherboard? Is the cpu voltage somehow affecting the motherboard directly (other than the cpu being physically in contact with it)?

I am rather new to these problems. Any explanation would be most helpful. Thanks!

 

[pcgeek11]

Thanks a lot for your response! What might have toasted the psu? Was my stress testing too much?

Also, how might overclocking the cpu damage my motherboard? Is the cpu voltage somehow affecting the motherboard directly (other than the cpu being physically in contact with it)?

I am rather new to these problems. Any explanation would be most helpful. Thanks!

How does overvolting effect your motherboard?

Voltage increases, Current increases, Heat increases. Each of these stresses the components on the motherboard.

The voltage for the CPU comes through the motherboard. Plus the added stress caused by the fan failing which equals even more heat...

 

[Rifter]

OCZ PSU's are weak.

That said if the fan on the H50 fried then i would replace that and see what happens. just make sure that the pump did not fry and that the H50 is still functioning properly.

I have run across boards in the past that would not boot if no CPU fan was connected, so maybe it is not seeing the CPU fan and thats why it is not booting.

 

[Tsavo]

OCZ PSU's are weak.

That said if the fan on the H50 fried then i would replace that and see what happens. just make sure that the pump did not fry and that the H50 is still functioning properly.

I have run across boards in the past that would not boot if no CPU fan was connected, so maybe it is not seeing the CPU fan and thats why it is not booting.

^ This

 

[history]

OCZ PSU's are weak.

That said if the fan on the H50 fried then i would replace that and see what happens. just make sure that the pump did not fry and that the H50 is still functioning properly.

I have run across boards in the past that would not boot if no CPU fan was connected, so maybe it is not seeing the CPU fan and thats why it is not booting.

Thanks a lot! I tried putting on a new 4 pin cpu fan earlier tonight, and unfortunately it still did not boot. If the psu fried, I would certainly smell it if I stick my nose to the back grill, no?

Thanks again!

 

[pcgeek11]

Thanks a lot! I tried putting on a new 4 pin cpu fan earlier tonight, and unfortunately it still did not boot. If the psu fried, I would certainly smell it if I stick my nose to the back grill, no?

Thanks again!

More than likely yes.

I think motherboard.

 

[DrMrLordX]

One of the reasons why the fan on your original HSF may have stunk so badly is that whatever magic purple smoke was released into your case most likely filtered through it on its way out to the exhaust fan.

Given what you were doing, I'm guessing you may have had problems with the motherboard PWMs. Were your case temps high? And what motherboard were you using?

 

[history]

One of the reasons why the fan on your original HSF may have stunk so badly is that whatever magic purple smoke was released into your case most likely filtered through it on its way out to the exhaust fan.

Given what you were doing, I'm guessing you may have had problems with the motherboard PWMs. Were your case temps high? And what motherboard were you using?

Thanks everyone for their input. I was wondering about the motherboard temps, as last week i noticed one of the MB sensors was running almost as warm as my cpu when stress testing! I *had* lol a Gigabyte p55a-ud3.

I wonder about the fan, because it was actually blowing cool air into the case, do you think that it still might have moved the *magic smoke* around and that is why it smells?

Thanks a lot!

 

[DrMrLordX]

Thanks everyone for their input. I was wondering about the motherboard temps, as last week i noticed one of the MB sensors was running almost as warm as my cpu when stress testing! I *had* lol a Gigabyte p55a-ud3.

I wonder about the fan, because it was actually blowing cool air into the case, do you think that it still might have moved the *magic smoke* around and that is why it smells?

Wait, the HSF fan was blowing cool air into the case, like through a side duct or something? Or are you talking about an intake fan?

 

[history]

Wait, the HSF fan was blowing cool air into the case, like through a side duct or something? Or are you talking about an intake fan?

Yes, according to Corsair's installation guide, the fan should blow cool air over the radiator, into the case. Now I am not sure this is the best method. I will give you all an update as I try another motherboard and psu. Thanks!

 

[DrMrLordX]

Oh yeah. Hmm!

It might have recirculated some smoke that vented out of the case. I had forgotten that you're using the h50.

Generally speaking, that is the best method for the H50 since it gives you a lower ambient to work with, rather than the potentially-hotter air that's inside the case.

edit: btw, after looking at the p55a-ud3, it seems to have at least adequate PWM cooling, not that there isn't the possibility of a manufacturer's defect in there somewhere. What kind of exhaust fans did you/do you have?