Installation from 10.6.8 - unable to select HD to install Yosemite

Hi all,
I have an old MacBook6,1 of 2009 (the white one), with a 2.26GHz Intel Core 2 Duo processor, 2GB 1067 MHz DDR3 memory, 250GB of storage capability (100GB free), currently running Snow Leopard 10.6.8.
I'm trying to upgrade to Yosemite 10.10 (my hardware and software are both ok to do the upgrade, I checked it). The download from the appstore went ok, but when I launch the installation app and I am asked to select the volume in which I want to install the OS, I'm not able to select my "Macintosh HD" unity (the icon is light grey), and if I try to click on it anyway, a message appears: "Impossible to use this volume to start the computer" (actually my mac is in italian so I reported the translation of the original message: "Impossibile utilizzare questo disco per avviare il computer").
I found out that some people had the same problem with the installation of Lion (OS X Lion: il programma di installazione indica "Impossibile utilizzare questo disco per avviare il computer" - Supporto…), but all the proposed solutions rely on the possibility of accessing "recovery mode", a functionality that is not enabled in snow leopard 10.6.8. And the only  solution that doesn't rely on this feature (you can find it at the same link reported above), requests a redimensioning of the partition assigned to "Macintosh HD", that in my case is the only one that I have (I don't have any bootcamp partition), and even if l do it, it doesn't work.
Can anybody help me?

Apart from your issue to start the downloaded installer, you must know that 2GB of Ram is the absolute bare minimum to run Yosemite.
You have to add Ram. You can have 8GB as a maximum.
I propose to install 2x4GB and the price is low, macs are very sensitive of the right type of ram and need a good brand. Usually Crucial or OWC is recommended here. It is not difficult to do it yourself, see the sites for instructions:
Crucial:
http://www.crucial.com/usa/en/macbook-%2813-inch%2C-late-2009%29/CT3373704
OWC:
http://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3
Is there a special reason to go for Yosemite (it is VERY different from SnowLeopard) ?
Lex

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