TV Screen goes Pink sometimes (connected to PC)

dear all,
i just installed my new pc and here are the specs:
- Asus P6X58D Motherboard
- Intel Core I7 980
- ATI 5970 GPU
- 12 GB RAM DDR3 1600
- 1 X Solid state Drive 256
- 2 X 1TB Harddrives
- Soundcard Creative Sound Blaster X-Fi Titanium Fatal1ty Champion
- Power supply unit 1250W
- Pioneer optical drive
- OS: Windows 7 Ultimate

have connected the PC to my newly purchased 40 inch philips 9704 via HDMI (DVI to HDMI converter).

performance wise, the new pc is a monster. but there is something that is really worrying me. Every now and then, happens like once every hour, the screen goes black for a sec and then goes pink. Sometimes it fixes itself after a few seconds and sometimes i have to change channel and then go back to the initial channel to adjust it (always worked so far).

i havent over clocked anything and all items including the tv are brand new. I have all the latest GPU drivers and im sure there isnt any viruses on the pc yet.

can anyone tell me what is causing this? im really worried, the system cost me a fortune