Before I start explaining, I want to note a few things: a) prior to today, it was working; b) I have researched this issue on various forums and sites and trying to reset the settings and everything, but it did not work.
I have checked to make sure the cable works and it functions with everything else.
I have done the tips suggested here and other sites of resetting everything. Did NOT work.
It was working fine previously with the same output device and cable and everything.
The output device I'm using is a Samsung HDMI monitor.
Try changing the HDMI port on the TV..... if that doesnt work, try another tv and all of its available ports..... if that doesnt work, get another HDMI cable and do it all over again on each HDMI and a different TV.
Try going to safe mode after reset, then update/reupload latest update using a usb, its the last option, also first vacumn the vents and all ports gently on the ps3 just incase there is dust clogging, it could be a fault in the latest update, something to do with the graphics card, otherwise your ports knackered m8,