CPS 2 consomme beaucoup, c'est peut être ton alim qui fatigue, l’écran noir en dessous 4.6V c'est normal.
CPS 2 consumes a lot, it may be your power supply that is tiring, the black screen below 4.6V is normal.
You have 700/800 only for parts, your exemple it's just a lucky shoot. At this price buyer looking for peacefulness, a model bullet proof tested with good SIMMS model (fujitsu) and already modded.