Ps3 wont take in any discs

Clean the ps3 with a laser lens cleaning kit like this one:
http://www.gamestop.com/ps3/accessories/ps3-cleandr-laser-lens-cleaner/93150

Base from the description of your problem this can be a an issue with the lens of your PS3 since it wont read disc at all, what you can do first here is to use a lens cleaner that you can get from any electronic store and run it to your PS3 to clean the lens that may have some dirt on it. Then after doing that and still same problem the lens will need replacement already. Have it check or replace from a Sony service center.

Your going to have to take the shell of the top and have a look inside

it happed to me to asked a guy on here called rmchegen

Please check the region code on the BD or DVD. It should match the region code set in the system. Otherwise the disc will not play

Sony will fix for about $150.00

You seem to have alot of problems with your console.

How old is your PS3?
Not loading 1 particular disc or all disc?

Assuming you PS3 starts up into the console screen, and fairly used, it might be time to replace the lens.

PS3 is The amazing device by sony but it has some common problems like disc read error, unreadable disc etc.... Good news is that these all problems can be repaired with the help of DIY Guides, one such guide available at PS3 Repair Blog

Hi Spooks,

When you put the Disc drive back together, the mechanism probably did not go togther properly. You have to put it together with a disc in the drive. It is very hard to get the disc player to go back together properly I know. I needed three hands to do it. I done one. It took me several tries, but I finally got it. Another thing, since you have already disassembled your PS3 and need to do it again, go to Radio shack and get some Thermal heat transfer compound, Replace the compound between the heat sinks and processors. The original compound dries up after about a year and will kill your PS3 completely if you do not do this. Good luck,I know its not going to be easy.