What does NO INPUT SIGNAL means when you turn on your computer?

I'm asking this question for a friend who is having this problem. Normally, she would keep her desktop computer at home. She been traveling with her computer over to her friend’s house & left it here. Then turned around & took it home with her. It was working fine the first night back & she didn’t have ANY problems. The next day she turn it on, she got a black screen saying:



VGA Input: No input Signal

Recommended system: 1280x1024 – 60hz



I haven’t did trouble shooting & repair in quite some time but, wouldn’t that screen mean her Video Card is loose or burned out?



All cables are in correctly & they are in working order. This is a older computer, with most of it cards & components updated. I do know it’s a Hewlett Packard Pavilion – 859c (1999 model) & a HP vs 17e 17” flat-panel LCD Monitor. She also uses Windows XP. Please help if you can.|||These might help you:



http://www.helpero.com/Questions-and-ans…



Helpero is a web site that helps every Internet user, from all over the world, solve any computer related problem. You can ask Helpero for free.|||Sounds like either a cable is loose or not connected OR the video card may need to be reseated into the slot inside the computer.|||This error means that the monitor is not plugged in completely or at all. This can also mean the video card is not plugged in completely or at all.|||you don't have connection to something either internet or something plugged into your computer. or if you have a router plugged in someone might be using your signal w/ their laptop|||if she has a video card installed she may have plugged the monitor cable into the built in graphics plug instead of the one on the video card. Please check this again cause it really sounds like a cable issue. Same thing happened to me once and I "knew" the cables were right