We are having a problem with several of our hp d530 workstations when you power the pc we get a green light and all the fans start working, but there is no signal reaching the monitor we just ger a permanent amber light, no beep codes i have tried reseating memory, checked connections to the board and replaced the cmos battery but still no display which leads me to think we may have a increaingly large amount of faulty motherboards. Or has anybody come across this problem?