I have Dell optiplex 745 PC, it was working so nice. now when I try to switch the power on I have the amber blinking light. I tried to unplug every thing connected to the system board. The power supply works well, the RAMs work so fine. I tried to power on the PC with only the motherboard , I receive the same problem. The amazing thing is that sometimes the PC boots and reached the desktop of windows and works fine. with the same steps it doesn't work sometimes.
Any advice??!!!
