HLN507W Samsung DLp Horiz. lines

I have HLP507W Samsung. 6.5 yrs old. have replaced lamp at 3 years and 6 yrs. hrs was total of 8295 last Oct 08 replacement. Had to replace the color wheel in Dec 08. All worked very well for 2 months Then got vertical lines about every 1/4 inch thru the picture. unplugged power for a while and tryed. then had good picture. This lasted about 2 weeks then got unreadable picture vertical and horiz bars of color. Unplugged then would be okay till turned off and on. Now I cannot recover just horiz jagged lines. audio okay. Have checked for loose plugs, wires with no avail. Any ideas? before changing color wheel, no problem except the loud whining noise.