Problem with turning pc on/off and clock(?)

Kamil_3

Honorable
Nov 5, 2015
6
0
10,510
Hello, people.
I have an issue with a (probably) mobo.
Since i've changed my pc's case, i have a few problems:
- difficulities with turning PC on and off. 50% of turning him on looks like he's not reacting to power button, then i'm slightly shaking him, and in the next try, up to 3 minutes, he's turning on (but sometimes without booting bios or OS). And when i'm turning him off, he's closing OS, but still runing on power, and not responding to power button.
- Windows/bios clock stopped and is stuttering around one hour.

What should i check first?

Cheers