plug the AV cables red yellow white into the console and use those to start the ps3..
See when you hold down the power button it can also reset the video and
audio cords to default..
when that black screen happens.. Unplug the cord, let it cool down completly... wait an hour then turn it back on..
you will have to turn it on by the powe button jst keep in mind tht the power button can also reset the vide/audio..
Its the internal/auxilary fan.. After the system gets so hot the auxilary fan turns on.. PS3 slim was designed to fix that flaw..
hopefully playstation will update that in the comming future.. but its nothing critical.. jst a bios error/cache error that only Playstation can fix
with its updates..