My system has recently picked up a strange issue, at the start of the day when I turn it on it never does post and doesn't do the single beep, it has no output to the monitor but the keyboard and mouse flash up. However if I just simply press the restart button it works absolutely fine. I know it's not a serious issue but it is a bit annoying, so if anyone has any tips I'd be grateful.
I've had the same problem with an old P3 system. I can tell you for sure that it is either a problem with the CPU or motherboard or both because I have switched out the ram, PSU and HDD over the years.