Yeah, my 42" samsung plasma did this also. Cured it tho, they were gonna bring me a replacement but as they didn't show up on time, I took it back to shop and got my money back. Then went and bought a 50". Thats working fine. If its any consolation, my other 42" Samsung has been ok.
When mine did this, helpline said remove batteries from remote. Then unplug TV and 'press' on/off button and hold for 1 minute. Seems this gets rid of any static build up. Then on remote, hold on/off button and the 1 button down for 1 minute. Then replace batteries in remote. Then plug in TV and see if it turns on. If it doesn't you could try all the above again but if no joy, I can't help any further. I'm only passing on info given to me by helpline.
Big Paul, January 2009