I am using a brand new NIB ECS PT800CE-A Motherboard (P4/Pentium 4 Prescott). The CPU is P4 3.0GHz 512K L2 Cache with HT (Northwood) which is working in another computer. The video card is CompUSA Radeon AGP 9200 128MB memory. But I can't get the POST message in monitor. Tried another CPU P4 3.0E 1M L2 Cache with HT (Prescott) and got the same situation. I did hear a weak beep after power on. It looks like there is no signal to monitor. What could be the problem? Very appreciate any suggestion. Actually, I tried half a month and feel so frustrated now.