Television and Home Theater

I BOUGHT A SONY KDF42WE655 REAR PROJECTION HDTV ON BEST BUY 7 MONTHS AGO..AT THE FIRST IMAGE WAS AWESOME BUT IN THE LAST 2 MONTHS I HAVE NOTICED WHITES LOOKING YELLOWISH AND SKIIES LOOKS GREENISH ON ALL INPUTS (ANALOG, HDTV, DVD)..I THINK IS TOO EARLY TO THINK ON A NEED TO REPLACE THE LAMP.. IS ANYONE HAVING A SIMILAR PROBLEM OR KNOW ABOUTH THAT?

i've had this tv for awhile now and never had any problems then along comes my son and he decides its best if he adjust the picture for me.So now my color is way off along with the brightness,tint,shaprness, and every other adjustment to be made in that catagory so if anyone knows what the Factory setup was there please let me know because i cannot get it adjusted back to normal now thanks for the help

Out of warranty only 26 days. Has frequently required unplugging since late Oct. Now only connected to antenna to reduce variables. If left unplugged for a couple days, it will power up and play for hours, then when powered down, will not turn on again unless left unplugged for several days. Dell's answer was to buy a new TV. Plan to bad-mouth them all over the internet. Please advise.