Question Upgraded CPU no display

[Salenski]

Hello,

I changed my i5 7400 to i7 7700k without updating my BIOS. Got no display nor did my keyboard and mouse show any sign of life. Googled and found out I had to take out the battery of my motherboard for a bit. Still didn't work. Changed back to my i5 7400 and now I get no display and my mouse and keyboard don't work. CPU and GPU fans turn on both occations.

Please help and thank you in advance.

 

[SkyNetRising]

Check cpu socket for bent/broken pins.
Make several high resolution photos of the socket (from different angles) and show here.
(upload to imgur.com and post link)