Your display is most likely set to a resolution and/or refresh rate that your monitor cannot handle. For example, a 17" and 19" LCD monitor can only handle a rseolution up to and including 1280x1024 dpi. A setting one notch above that will give you that notice and not display a thing.
If you haven't adjusted the resolution prior to it not working, check the video cable. If that's not the problem, you need to find the key on your keyboard that says "fn" on it and hold that down while you press the key that has the blue outlined picture of a monitor on it. The display should switch to mirror your laptop's display or black out the laptop monitor and display the picture on the flat panel.
I am trying to determine if I have a problem at the computer or the flat panel tv/monitor I am trying to hook up. The flat panel worked the first time I hooked it up, but after that it gives me a ''no video signal''. I have hooked the computer (laptop)to a second flat panel tv/monitor, and get the same message, so am thinking it is output from computer, but don't know how to check it out.
My Computer Information - General
Please wait while information is being collected...
100% (collecting Local Disk information)
System Model: Presario 2100 (PF181UA)
BIOS Version: Phoenix Technologies Ltd. KAM1.60
Microsoft Windows XP Home Edition
Service Pack: 2.0
Hot Fix: KB925486
Capacity: 1 GB
mobile AMD Athlon(tm) XP2800+
Version: x86 Family 6 Model 10 Stepping 0
Speed: 2120 MHz
General Computer Info
System Name: RON-K6Z5N45DNEH
Time Zone: Central Daylight Time
Connection: Workstation (standalone)
Proxy Server: Auto
IP Address: 0.0.0.0
IPX Address: Not Enabled
Total Capacity: 74.52 GB
Sum of Hard Disks: (C: )
Used: 20.39 GB
Free: 54.13 GB