Sometimes it shows no disc,when it does start a lot of the times after aprox 15 or 20 mins the picture freezes,can you help?

The laser is wearing out. If it is under warranty you can send it back to Sony for free repair. If not, they will charge you $150 to fix it.

Replace the Main bd.

it looks like it could be a virus or malware because if you use the internet and are using windows through your ps3

I know exactly what your problem is. I am huge nascar freak so you know i gotta have the games. Well it just so happens that i was playing on xbox live on my first month and have been hearing a lot of people saying how their console says the same thing well i looke for the answer. It turns out that after lots of playing for long periods of constant play time(3-8+)hrs. without freezing and getting any break at a time. Can sometimes put a ring some times invisible around the disc almost always permanently damaging the disc.

This sounds like you laser has gone bad.  

the lens on laser needs cleaning manually never use disc cleaners ever

You may check out Wii Fix Guide to fix the problem yourself. This DIY guide will show step by step pictures to fix the problems yourself without any technical knowledge.

coby dvd-233 cd wouldn't spin invalid disc is displayed on the tv please help me solve this problem

you xbox is probably dead smack it up a bit. nah jokes you need pro help

just call 1800-4my-xbox