irregular problem

I recently built a new pc, a field which i am quite experienced with. Either way i seem to have a bit of trouble with my new build. The PC will always POST, but my display only turns on backlight, without even loading BIOS. This happens most times that i reboot the computer. Could this be...

My laptop has a problem were it won't recognize that my ethernet cable is inserted. This happens irregular. One day it works fine, the next only wifi is available for use. Is there any driver that I need to install to fix this? Or do you have another possible solution? My current Networkadapters...