Computer won't even POST after CPU-Upgrade

[pascal.schaible94]

Hey guys!

I recently upgrade my CPU from a i3 2100 to a i5 3750, both with LGA1155.
I work in the IT department myself and I consider myself to be pretty okay when working on computers but this Problem seems strange to me.
The Problem:
I seated the new CPU to the LGA1155 (without power, thermal paste applied properly, ...) and tried to power it on. The computer starts for about 3-4 seconds and turns off again which loops all the time.

Things I tried:

• 
  - Updated the BIOS to newest Version which supports my CPU
  - Cleared CMOS
  - Rebooting with old CPU works, all other components work with the old CPU
  - Did the benching I read in all the posts here
  - Tried another PSU, no difference

At one point I assumed the CMOS battery may be a little weak after all the time, so I replaced it. It still didn't work, so I connected the CLR_CMOS Pins to reset the CMOS, still no difference. Then I removed the Battery completely for 10+ minutes. Putting it back in and tried to start- no difference. Did try it again for 20 minutes and was like - hey, why not? Let's start without the battery in. And in that case, the computer turns on and stays on, but won't show POST screen or any other reaction. After putting in the CMOS Battery back in and trying again, it is again in a loop with no POST to see.

Can you guys tell me anything I don't know or missed? I just bought the CPU from eBay and hope its not broken.

As I tried to point out: All Hardware works with old configuration, new CPU leads to power on/off loop. Removing CMOS Battery leads to power on, staying on but wont POST.

Thanks for any advice!

 

[alexoiu]

Hi, It looks like a defective CPU to me.

 

[pascal.schaible94]

Yes everything seems to be the CPU, but the fact that its different with or without CMOS Battery in really disturbes me. If its the CPU, shouldn't it be no matter if its in or not?

 

[alexoiu]

Not sure about the cause.

 

[pascal.schaible94]

Thanks for the input so far mate! Anyone else got any idea what could be the cause?

 

[Wolfshadw]

What is the model # of the motherboard?

-Wolf sends

 

[pascal.schaible94]

Just recognized that my Mobo got Dual BIOS, which is as far I know that it got a Back-Up BIOS for when the main BIOS fails. Could it be possible, that the PC can't boot, switches to the second BIOS which is maybe not affected from the CMOS reset causing the problem?

 

[pascal.schaible94]

Motherboard is: Gigabyte GA-PA65-UD3-B3 (rev 1.0)
Got some quick specs here: http://www.cpu-upgrade.com/mb-Gigabyte/GA-PA65-UD3-B3(rev._1.0).html
Gigabyte: http://www.gigabyte.de/Motherboard/GA-PA65-UD3-B3-rev-10#ov

 

[Wolfshadw]

Assuming you meant the Intel Core I5-3570 (not 3750), did you update the BIOS version to F12 or later? That would be required for the 3570 to work with that motherboard.

-Wolf sends

 

[pascal.schaible94]

Yeah, I meant the 3570 (It's 3:37 right now over here😛 ).
I arleady did the update and the POST-Screen with the old Processor shows the F12 Version

 

[Wolfshadw]

If you're currently running the F12 version of BIOS, then it should be working. It could be a dead processor. Does the system completely boot with the old processor installed?

-Wolf sends

 

[pascal.schaible94]

Yes it boots with the old processor completely.

 

[Wolfshadw]

Then I suspect a defective processor.

-Wolf sends

 

[pascal.schaible94]

Yes I thought so, just hoped maybe I'm missing something... just opened a case on EBay and going to order a new one. I just want to keep my PC alive for a little longer, can you suggest me a 1155 CPU for under 70$? Or ist the i5 3570 quiet fine?

 

[Wolfshadw]

Yeah, the 3570 was a decent processor for it's day.

-Wolf sends

 

[pascal.schaible94]

Thanks for the help so far you two! If this topic doesn't get closed I will give an update how it is with the new processor. Have a good one!