no signal to monitor help

[windows7forlife]

recently, my pc has been acting funny. i was using it one day. i got off of it and went bed. i got up in the morning and tried to use it and my monitor kept saying no signal. i unplugged the vga cable and plugged it back in. nothing. i have currently tried everything i can. ive taken it apart and blown the dust off. ive cleaned off the ram drives. ive taken out the cmos battery and put it back in after 30 min. ive tried other monitors and it does the same thing. the only thing i havent done is replaced the power supply or the motherboard or gpu. somebody please help ASAP.

 

[cwli1_]

Which ports on the PC have you connected it to? Ports do fail.

 

[ffg7]

does the motherboard also have onboard video & if so then pull the videocard out & use the onboard video to see if still an issue?