Laptop keeps freezing and fading to white.

[Kosheh]

That'll be something for the weekend if I can find the time and some instructions. I'm not too computer savvy, but I've been meaning to examine the cd tray anyway. (It popped out randomly one day.)

It always boggles me when I hear that someone's a PC gamer and isn't computer savvy. 
You'd think the two would go like, hand-in-hand :/ That's...the first time I've ever heard of a screen fading to white, though. 

In line with everyone else's advice: get some canned air and blow out the vents of the laptop. Except if it's a dust-related issue, it's probably (and unfortunately) too late for you to do much about it. :/
Also, don't forget to check Lenovo's site - there's a lot of updated drivers that Lenovo's put out and it'd probably be worth your while to install each of them!

Things you'll want to try: 

- Does it happen when you move the screen a certain way?
If so, there's an issue with your laptop's ribbon cable. Either replace the screen, or purchase a new laptop. :/ If your laptop is >4 years old then it's probably about time...

- Try working with the laptop on external monitor. 
If it works fine when you plug it in to a monitor, it's either a driver or hardware issue (I'd probably troubleshoot the former first; move onto the former) 
Either scenario, yep, points to a new screen. :/ But hey you're using it on a monitor - you can just mod the laptop to go headless

- If neither works, then your heatsink's probably shit the bed; the compound responsible for Keepin' It Cool has dried up.
Your only choice here is to take apart the machine and open up the heatsink, blow out all the dust and replace the heatsink compound.

Of course this is kind of a pain in the ass so you might wanna ask a tech-competent friend to give you a hand with that.
But yeah that's all I can think of for now. Let us know how things turn out I guess. :/