Assuming it is the BIOS, you will have to:
- install a cpu that is supported by the current bios,
- then do the bios upgrade,
- then install your i5-7500.
This asrock table may help you: ASRock > Z170A-X1/3.1
To Al Hill: Thank you for your contribution.
psychmd, the chipset installed on your board (Intel® Z170 Chipset) was meant to be compatible with the 6th Generation Intel® Core™ i3, i5 & i7 Processors. Since you have a 7th Generation Intel® Core™ i5 Processor, that's why a BIOS update is required.
As Al mentioned, it is better to get a board with an updated BIOS, you can also go to a computer repair shop, sometimes these kind of services (BIOS update) are provided, and is less expensive than getting another processor.
Please let me know how it goes.
After waiting for ASRock to send me an updated bios chip, which of course I never received, I bought the Celeron G3900. I updated the bios with it, switched the cpu to my original purchase--I5-7500-- and I'm writing to you with this new build.
Thank you much for your interest. It is appreciated.
I also want to thank Al Hill for his input.