The thing that bugs me about my situation with my 60gb is the fashion of the ylod. It was working fine, then installed geohot 3.55, crash then only powers on for 2 seconds. There was no noticable steady decline before goehot 3.55 and from what I am reading, this is not an isolated incident.
i have a similar problem right now, ps3 40gb NO-BC, started to freeze after 2 days with CFW 3.55, Coincidence? i don't think so. i rarely use it, in fact the last 2 days was most of the time in the xmb. Mine turns on about 10 seconds, sometimes i manage to reach the system settings but then it turns off.
What i hate is i can't re-install the official firmware because the damn thing got freeze or turn off.
fat system : flip the on/off switch to off then hold down on the eject button then flip it back on don't let go of the eject button until u hear the fan
slim system : unplug ur system press down on the eject button , then plug it back in do not let go until u hear the fan
then turn it off after a few seconds or so
if the fan does not turn on then the short is there . most common the wire came off while being moved from place to place. over time the wire will come loose do to usage and because of the way the connection is
this is the fastest way to see if the short is there without opening it. the ps3 without the fan over heats the motherboard within 10 seconds and u cant tell by touching the system.
all the connections are made poorly due to the cost of the system they had to cut corners somewhere.
One of my friends had the exact same problem as listed. All he did was just buy a new one instead. I have the fat model and i haven't had any problems with it. Since I bought a PS3 intercooler fan for it. It can runs for hours and never over heats.