Help: Sony 360 "invalid" message; won't play BD

[olivehead]

i have 2 360s, each attached to a panny plasma. one in the living room i've had for about 4-5 months with no issues. the other is 3 weeks old and was originally hooked up to an insignia LCD and at that time played BDs and DVDs. the LCD crapped out in short time (that's another story) and until i could replace it had the player hooked up to a 27" tube tv. player continued to play fine, but i think we only put DVDs in it for a couple weeks, no BDs. moved the living room tv to the bedroom and got a new LR tv. no problems with the LR player, but now the 2nd player, now that it's attached to my old plasma, will not play any BDs, including ones that it played 2-3 weeks ago, but will play DVDs. the screen says "cannot play" or something to that effect, and the front of the player shows "invalid" for any BD i put in it. has anyone ever seen this, and is it at all possible that it's related to being hooked to the plasma? like i said, my 1st 360 that's now been hooked up to both of these plasmas hasn't had issues hooked up to either plasma. is this all just coincidence and the second 360 just picked that time to go batty? thanks for any info.