i5-8400 doesn't work on my PC

May 15, 2018
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Product Name: ENVY Desktop - 750-415
Operating System: Microsoft Windows 10 (64-bit)
Greeting all

I installed new processor on my ENVY Desktop - 750-415.
New CPU pc won't turn on, Fans spin a second and then turn off again and again. I updated BIOS to last version but still giving the same issue.

I installed old cpu back everything works fine.
I removed jumper and installed back but still not started

Any one could guide me please
 
Solution
Yup, that PC appears to have come with an i5-6400. If the motherboard runs a Kaby Lake, it's not a motherboard that's compatible with Coffee Lake. Same number of pins, but what the pins do aren't the same.


The 6700 is the best CPU from the list regarding "Processor Upgrade Information". But the 7700 should work with that motherboard as long as you completed the bios flash. It is a OEM board, so there is always a chance that it wont work, but it should. In the end, there is not much of a difference between the 6700 and 7700 besides a few MHz increase. So I would look for a good deal on a used 6700 and you will have a really good CPU that is just as good as a 8400.