Dogz 3 keeps freezing

if its only happening on disc games i would say the lens is going bad.

PLEASE....give some info about your computer....cpu...ram...etc..etc

fix your PS3 so that it turns on again...
now the only reson there is 6 videos is because this one is a complete guild from tear down to rebuild... follow it exactly and you should be fine.

it could be a hard drive problem or if the PS3 is in an enclosed cabnit it could be a sign of over heating

i had the same issue when i played Call of Duty 3 after 3-4 hours of playing it freezed suddenly.i had something underneath it an towel so i wont get it scratched but after i removed it,it stop freezing,but i advise you to keep the PS3 where it has air to get well ventilated and you wont get any troubles with it...it's not human that the PS3 freezes

Try using a can of air to blow out the fan area. Even though its well ventilated it may be full of dust. It sounds like an overheating issue. Also look into aftermarket fan/cooling solutions, that dont plug directly into the PS3 and have there own outlet power plug.

USE A DISC CLEANER DISC AND TRY OPENENING UR PS2 AND BLOWING IT OUT

PS3 is one of the most amazing gaming device but like other competitor gaming devices (Xbox and Wii) It also has some problems like Freezing up. You may check out the informative Article at ezinearticles Remedy for PS3 Freezing up.

Check if there is something overheating (inside or on the adapter).
The 'almost' mint condition might have blown a fuse or capacitor or something minor.

If you are brave enough, disassemble the console and look for anything out of place.

Good luck!