What is dead? CPU or Motherboard?

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holeekebab

Reputable
Jul 21, 2016
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4,510
Hi

I just overclocked my PC.
I used it properly after the overclocking and turnt my Computer off.
When i attempted to turn it on again it didnt want to.
I have done a power supply test and my PSU works. While i was doing the power supply test my motherboard was shining its light like usually. Now I have a question.

Can i be sure for 100% that my CPU has Been fried since my motherboard seemed to have its light shining?

Best regards.
 
Solution
W
Have you taken the PSU out of the case and jump started, looking to see if the PSU fan spins?

If you take the 20+4 pin connector on the PSU and look at it so that the clip is on the right, you can put a paperclip into the second and fourth wires down on the right side. This will jump start the PSU. If the fan does not spin then the PSU is likely dead.

If it spins, try taking a multimeter and checking voltages on the connectors. The below links can help you in figuring out how much voltage should be in each connector.

https://www.google.com/search?q=24+pin+pinout&biw=1680&bih=956&source=lnms&tbm=isch&sa=X&ved=0ahUKEwivkb262pHOAhUIID4KHfK5ACMQ_AUIBigB#imgrc=783ef4bOQx31YM%3A...
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Rogue Leader

Rogue Leader

It's a trap!
Moderator
Dec 22, 2014
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I am assuming you overclocked at the BIOS, if so unplug the computer and pull the little CMOS battery from the motherboard for a couple minutes. This will reset the BIOS settings. Put it back in and try to boot the PC again. If it was working fine and didn't just shut off on you its unlikely you broke anything.
 
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weberdarren97

Glorious
Aug 10, 2015
8,137
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If OP's motherboard has a Clear CMOS jumper, wouldn't that be a better option?

In my Asus M5A99FX PRO R2.0, I wanted to undo an unstable overclock so I powered down, unplugged the system, pressed the power button for five seconds and removed the CMOS battery for thirty minutes. I came back to it after lunch, put the battery back in and tried to boot. A BIOS screen came up that CMOS settings were lost and that is was recreating them, then my unstable overclock was back and still a problem. Next, I moved the jumper from "Boot" to "Clear CMOS" and that took care of the issue.
 
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mbarnes86

Splendid
Sep 16, 2010
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Hi

Have you reset the cmos using the jumper on the motherboard
This would clear any overclocking
This often lets the system restart normally again

How did you overclock the system?
Increasing the voltages can do permanant damage, while intel K and some AMD cpus can be overclocked on suitable motherboards

Give cpu & motherboard and ram details

Regards
Mike Barnes

 
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Rogue Leader

Rogue Leader

It's a trap!
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Dec 22, 2014
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I don't know how that happened because its normally 6 of one half dozen of the other. Never in my life has pulling the battery not worked.
 
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weberdarren97

Glorious
Aug 10, 2015
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Well it kind of worked... It forgot many things, but somehow recovered and automatically applied the OC settings.
 
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holeekebab

Reputable
Jul 21, 2016
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4,510


I have an MSI h55m-e33
And no i cant get into BIOS it just doesnt want to do anything.
When i turn on my PSU nothing happens, but my PSU is working properly.

 
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weberdarren97

Glorious
Aug 10, 2015
8,137
6
45,615
Have you taken the PSU out of the case and jump started, looking to see if the PSU fan spins?

If you take the 20+4 pin connector on the PSU and look at it so that the clip is on the right, you can put a paperclip into the second and fourth wires down on the right side. This will jump start the PSU. If the fan does not spin then the PSU is likely dead.

If it spins, try taking a multimeter and checking voltages on the connectors. The below links can help you in figuring out how much voltage should be in each connector.

https://www.google.com/search?q=24+pin+pinout&biw=1680&bih=956&source=lnms&tbm=isch&sa=X&ved=0ahUKEwivkb262pHOAhUIID4KHfK5ACMQ_AUIBigB#imgrc=783ef4bOQx31YM%3A

https://www.google.com/search?q=24+pin+pinout&biw=1680&bih=956&source=lnms&tbm=isch&sa=X&ved=0ahUKEwivkb262pHOAhUIID4KHfK5ACMQ_AUIBigB#tbm=isch&q=molex+pinout&imgrc=nhDjb8Eq1fhorM%3A

https://www.google.com/search?q=24+pin+pinout&biw=1680&bih=956&source=lnms&tbm=isch&sa=X&ved=0ahUKEwivkb262pHOAhUIID4KHfK5ACMQ_AUIBigB#tbm=isch&q=pcie+power+pinout&imgrc=Nwxh-F5TK8oibM%3A

Update: Please make sure that the PSU is completely disconnected from the computer before trying this. Also make sure that the paperclip doesn't touch any metal while in the connector (I usually set it on a cardboard box). Never touch the casing of the power supply while also touching the paperclip, you'll get shocked (not enough to hurt you but I definitely felt it).
 
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Solution
chenuki

chenuki

Respectable
May 11, 2016
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1,960
Please don't use the dangerous paperclip procedure. You could get electrocuted. No PC part is worth that risk.

Reset CMOS by pulling coin battery and checking the mobo manual for LED status light are the right ways to proceed.
 
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weberdarren97

Glorious
Aug 10, 2015
8,137
6
45,615
Just because LED's come on doesn't mean it's getting proper voltage. I've had power supplies deliver 8V on the 12V connectors and the LED's still came on.

Paperclip method is dangerous? Jump starting a power supply is in the CompTIA A+ training. It's not hard to do. As long as you don't touch an active ground like the casing while you're touching the paperclip then you'll be fine. I wouldn't say it's any more dangerous than not unplugging a system before installing a device's power connectors (which literally everybody does)
 
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