A case speaker is very useful in these situations as the beep codes give alot of clues as to what may be wrong as in memory probs or video etc.
Building a new system using an ASUS A7N8X-X motherboard with AMD Athlon 2500+ CPU and 512 MB RAM which is identified as correct for this configuration. Have installed all in an ANTEC CS600 case along with a new 450 Watt power supply and a new floppy drive. I am using my old 128 MB video card which is working. Connected keyboard, mouse and monitor. No HDD installed or any other cards. Plan to install them one at a time so any problems will be isolated. Problem is, on turning on power the power supply, case and CPU fans all operate and there is a green light on the motherboard which also lights, but monitor stays black. No speaker in case so don't know if there are beeps, but I doubt it. Do I have a DOA motherboard, a DOA CPU or is there something else I should check first?