Originally posted by yan040714
My phat ps3 powers off and flashes the red light after 20 minutes just on the xmb and whilst on call of dutys and GTA it powers off within 60 seconds , I don't know what's causing this and I don't know how to fix.
Sounds like a YLOD (Yellow Light of Dead).
Your console overheated. This caused the CELL or RSX to let off from the Mainboard.
You have to let your console get reballed or atleast reflown to work properly again.
If it is the first time this happened you can try to replace the old thermal paste with new one. Also you can try to tighten the screws (which hold the Heatsink again the CELL & RSX) a bit more, but these are just temporary "solutions".