Originally Posted by wizdumb
99.99999% of the time with these consoles (pre-nor consoles with a separate pcb for power/eject that connects to the ps3 with a ribbon cable) when the power supply has been ruled out as the cause. It is a broken ribbon cable between the power/eject switch and the motherboard.
This happens because of the length of the plastic bit on the end of the ribbon cable to help remove/insert the cable. It sticks out about 2mm so that it doesn't seem to be in and most people use too much force (which is very little anyway) and snap it just enough to break it.
An easy way to check is to examine the ribbon cable on the motherboard side under a magnifying glass (or just look closely) and you will see the points where the contacts sit on the ribbon cable. Just above that you should see a hairline fracture where the wire in the cable is still bare.
Its easily fixed too,less than a five minute job.
Steps as follows:
Step 1)Take a pair of scissors or something sharp to evenly snip the last 1mm from the motherboard end of the ribbon cable.
Step 2)reconnect it then power on the ps3 to see if you get standby lights.
If no lights show up yet repeat steps 1-2.
If all goes well you will have a ps3 with working power/eject buttons and lights
Anyone can fix it and its a simple job. From memory i had to take 2-5mm off from mine to fix it. Safest option is to snip 1mm off and test it rather than to snip 5mm off and then have to strip the end to try and fix it. (much more than a 2minute job)
I have a picture of the ribbon cable with a couple mm snipped off somewhere i will upload it if i find it but its not much at all.
Hope this post helps someone to fix their ps3 and im sure someone will be kicking themselves when they realize they sold a probably repaired ps3 for so cheap!