Hi. A couple weeks ago I turned my computer on and I got no vga signal. I searched the forums here and dwindled it down to either a graphics card issue or motherboard issue going by the most popular responses to the question. I replaced the graphics card first and it didn't help. So I just replaced the motherboard and it still didn't help. I've tested the tower on another monitor. No luck. Can anyone tell me what to look for next? No beeps on either mb when I start even though I know the latter is good. This is really driving me crazy. Thanks