Apple Hardware Test on Macbook Pro Core 2 Duo (early 2007) with no DVD?

Hi,
My Mac is keep on freezing and I would really like to know what is wrong with it. (I did PRAM NVRAM reset 100 times... didnt help.)
I can't find my OSX Tiger DVD which was included when i bought my Macbook Pro in January 2007. So I've been reading through forums like crazy trying to find another way to run AHT (apple hardware test). So far I came up empty.
So my question is: If I upgrade from Lion (which is my current osx on this machine) to Mountain Lion, will I be able to use online AHT (option + d)? Or more general: is there any way to run AHT on my machine or any other way to find the broken component. or should i just throw it away?
Thank you.

Take your machine into your local Apple Store or an AASP and they will run free diagnostics. If there's a lot that needs to be done on your machine to get it back up and running, ask about Apple's flat-rate repair pricing. For less than $350, you could have a machine that is almost like new.
Clinton

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