I have set up a new motherboard on an old chassis of a desktop PC. The mb has its own embedded GPU, and I haven't added any additional graphic card. I have connected the mb to the PSU through the 24-pin EATXPWR ATX power supply plug (I couldn't find out of the PSU any 4-pin connector to plug into the mb's chassis-fan plug). When switching on the PC, both the chassis fan and the CPU fan start working, but the monitor doesn't receive any signal. The monitor itself is working on other PCs. I am a bit lost about what steps to take before sending back the mb go the seller.
I have also followed without success the suggestions of the answer below by user3797758:
- I cleared the RTC ram
- mb is Asus B150M-C and looks perfectly compatible with CPU which is Intel Core i7-6700 (the CPU itself is shipped with Intel HD Graphics 530)
- I have tried connecting the pc to a HDMI monitor as well as to a different VGA monitor. Both monitors work well with the same cables, therefore the problem should not be there.