I am not very good with computers or computer terminology but can someone please help me.? My computer turns on and fans are running but my monitor says no signal. I checked to make sure everything was plugged in correctly. It has done this before but all I had to do was turn off the computer and then turn it back on again and it would work. I tried doing this about 10 times but it didnt work this time and there were no beeping sounds. What can I do to fix this??