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new processor, PC will not start!


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#1 wonderings

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Posted 09 May 2015 - 06:46 PM

I have a PC that I upgraded... or tried to upgrade the CPU today. The PC is about a year and a bit old, had an i5 cpu. I bought an i7 4790K LGA1150. When I put in the new CPU with heatsink and plugged it all in, the PC started for a brief moment, all the fans whirred accept the heatsink and then shut down, then repeated again fans (save heatsink) whirred and shut down. It keeps doing this till I power it down. I checked the cables, everything is connected correctly. I put back in the old i5 processor and used the new heatsink and every started up properly and booted into Win 8.1 64 bit with no issue. 

 

The motherboard is a Gigabyte GA-B85M-HD3. I have a 750w PSU, 8 gigs of ram and a GTX 970 4gigs. Again, everything works fine with the i5 chip installed, but not with the i7. I have never replaced a cpu before, could this be a bad CPU? I tried looking for any updates to my BIOS but it looks like there is no updates for it and has never been any updates for it. So bad CPU or am I missing something?

 

 

thanks!



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#2 TheN00bBuilder

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Posted 09 May 2015 - 06:48 PM

Have you cleared the CMOS?


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#3 wonderings

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Posted 09 May 2015 - 06:57 PM

Have you cleared the CMOS?

 

What is the CMOS? This is my first time delving into replacing a CPU, only done GPU and PSU before.



#4 TheN00bBuilder

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Posted 09 May 2015 - 07:05 PM

Take out the button cell battery on the motherboard with the computer unplugged. Leave it out for 10-15 minutes to make sure the memory is gone, put it back in and try it with the new CPU.


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#5 wonderings

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Posted 09 May 2015 - 08:05 PM

Take out the button cell battery on the motherboard with the computer unplugged. Leave it out for 10-15 minutes to make sure the memory is gone, put it back in and try it with the new CPU.

Ok tried that, power cable unplugged from the PC, removed the cell battery for an hour, put the battery back in, plugged it in and started up. Same problem as before.



#6 TheN00bBuilder

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Posted 09 May 2015 - 08:43 PM

Okay. The motherboard and BIOS does support a new Haswell CPU. It could very well be a bad CPU. Try to make an RMA with Intel.

 

http://www.intel.com/p/en_US/support/warranty


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#7 mjd420nova

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Posted 09 May 2015 - 09:26 PM

Go back to the original CPU and confirm that all still works that way.



#8 wonderings

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Posted 10 May 2015 - 12:06 AM

Go back to the original CPU and confirm that all still works that way.

When I first saw it was not working I put the original CPU back in to see if it worked like normal, and it did. I am going to return the CPU to the store I bought it on Monday. I just bought it today.






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