New tests yesterday.

In fact, I have two problems:

- The HD621 display a 256 colors image when processing 1080p video signal and 5.1 signal.
With a less complex signal, the colors are ok.

- The G68 run fine only the 10 first minutes. Once warm-up, he don't stop re-starting.

Can it be the result of a faulty power supply? (it's more than 10 years old.)
What skill is needed to replace the power supply and where to find one?

Serge

G68ADV + HD621 (dead)
2xBSS 366
LCR Yamaha DSR112
4 Surround Presonus Eris E8
1 JBL 4645C sub and 1 DIY sub with WGTI15 woofer (Crest Audio 8001 amplifier)
3D-Lab Dvd Master/Panasonic BDT700/Panasonic UB420
JVC X7900