Kernel panic at boot - Yosemite

Hello, I got a problem 2 days ago with my macbook pro mid-2009.

It stopped and when I tried to start it again, I got a kernel panic screen during boot.

Context :

- Macbook pro mid-2009

- Ram : 8Go (i changed both RAM modules 2 months ago)

- Memory : Hard drive + SSD (i added the SSD 2 months ago)

- The drive is protected with filevault2.

I cannot boot from the internal hard drive neither from a bootable hard drive (external) with Yosemite application on it. Each time i try, Mac OS tries to load and the kernel panic appears very early during the process.

I do not have the recovery partition on the laptop so I cannot start disk utility from there.

I think that the problem could come from the RAM modules because of the impossibility to boot from an external hard drive or mother card... but i'm not sure !

Could anyone confirm or help me with this problem ?

Here are some photos of the log when I start in verbose mode (the log is complete) :

If anybody has an idea, I would very grateful !

Thanks