Hi and thank you.
I builded 1 year my own PC, Specs:
CPU: Intel® Core™ i7-4790K ~4.0Ghz
RAM: Crucial Ballistix Sport 8GB (2 x 4GB) 1600Mhz
PSU: Thermaltake SMART M Series SP-850M 850W
MOBO: MSI Z97 PC MATE
WC: CORSAIR H80i
Since 6 months ago i was having a trouble: Sometimes when i was turning it on, it turned on and off repeatedly, the solution was: Remove the CMOS battery. 1 week ago a decide to clean it up, then i put everything back, and when i turned on, i got the problem, but this time removing the CMOS battery didn't work, i bought 12GB ram (1x8gb, 1x4GB Crucial Ballistix Sport @1600ghz), and helped me to understand what going on: Channel B (3 and 4 slots, counting from left to right) wasn't working right.
RAM in slot 1 only = boot
RAM in slot 2 only = boot
RAM in slot 3 only = turned on and off repeatedly
RAM in slot 4 only = turned on and off repeatedly
RAM in slot 1&2 only = boot
RAM in slot 1&3 only = turned on and off repeatedly
RAM in slot 1&4 only = turned on and off repeatedly
RAM in slot 2&3 only = turned on and off repeatedly
RAM in slot 2&4 only = turned on and off repeatedly
RAM in slot 3&4 only = turned on and off repeatedly
RAM in slot 1,2,3, and 4 = Boot (No display, keyboard and mouse were not lighting)
I tried:
Update to latest BIOS version
Clean slots with Contact cleaner (DeoxIT D5)
I don't know how to check voltage, etc.
Thank you so much