cable tv, computer, and a tv

[Susan]

This worked before I moved everything into a different room.  This is what I want, and what I had before:  A really good computer with tv tuner card.  Cable tv antenna attached to the Input of a 4 way splitter.  From splitter, a coax cable to tv.  From splitter, a coax cable to computer.  Simple.  The tv is old, with only one co-ax cable connection in the rear.  I used to be able to watch tv, and record another show onto an external hard drive.  Or, whatch tv on a second monitor.  Now, the cable connection to the computer is causing static, disrupting the main monitors signal, causing a humming noise plus wavy lines.  What happened?  Do I need a new splitter?  A new cable?  Both monitors are 19 inch LCD's.  Currently, the second monitor is not attached, but will soon be.  Any thoughts?  Suggestions?  Ideas?  Questions?

[JP]

Look for anything that changed after the move, if it worked before it should still work if it is connected the same way. Maybe there is a loose connection or a loose connector on the cable.