There's a similar thread about this but I dont want to hijack someone elses. I re-balled a 60g back compatible ps3 yesterday, when I tried to test it, I switched the back switch on.. stand-by light came on, touched the power button on front and it immediately shuts down, the green light shows for a split second nothing else.
Took it apart again, made sure the power button ribbon cables were ok which they were, then took the power supply and checked that... it gives 5v at the back where it joins to the mobo, and 12v underneath where the two large pins slide into it (I bridged wire 1 and 5 at the back to test this), tested fuses inside power supply as-well which were ok, so im assuming the power supply is good. I dont have any experience with ps3, but im starting to think bridged solder under rsx, as it acts like a short, had a look around the rsx where I was working, cant find anything there causing a bridge. Should I remove the rsx and start again?