Television and Home Theater

I have a KP-46WT500 that is about 4 years old and all off a sudden I'm getting some green looking lights on the tv and it shuts off flashig the self-diagnosis light eight times.  According to the Sony tv blinking conde, this is a problem with the audio, unit goes into standby and blinks the self-diagnosis code - check IC406 audio amp, PS401 and 402.  Is this something I can fix myself?  If so, how?  any info would be helpful.

 Thanks

I've had this Gateway 50 inch Plasma since 11/21/03 and until recently it's been great.  However, since 12/26/06 it has developed a problem:  at first start-up, each day, it flickers, much like a strobe light, never going dark completely rather like a pulsation.  This begins very strongly and lessens to some degree for a full 20 minutes and then it stops and is just fine.  If the TV is turned off for a period that same day and restarted, it does this flicker-pulsation for about 10 minutes and then is fine.  I'm wondering if it's worth going

I have this JVC TV and have a problem... for the last couple of months when I switched from any input (i.e. video 1 through digital in) to another input the screen would display either one of three things:

a plain grey screen with the bottom of the screen having a bowed black section.

a plain green  screen with the bottom of the screen having a bowed black section.

or, a screen split vertically in half with one side blank or grey, and the other side scrambled vertically.

I have equipment hooked up as follows: