When you switch it on im getting the red light then green for a second then back to red

Does the lights blink red? If so, you have the infamous YLOD, aka. Yellow Light of

Death. This is the number 1 cause of pS3's dying. It is an overheating issue

linked to your CPU and GPU (the processor chips) You will need to find a local PS3

repair shop who can repair this. Do not try to attempt repairs seen on the internet yourself. You could make things much worse and render the unit totally unresponsive.

The repair process takes about 3 hours.

IS THERE A DISC STUCK INSIDE?

If you have a unit that is not backwards compatible, any non 60g or 80g then you

can retrieve your disc.

Power off the unit using the toggle switch on the back. Hold down the 'eject'

button and turn the toggle switch back from off to on. This will run a fan test

and eject your disc. Remember, this will only work on the 20, 40g models. Not the

backwards compatible units with the 4 usb port holes and the memory card slots.