Mbox 2 Protools 7 Macbook Pro can't get it to work

Am just resetting up my home studio after some years absence. With a mac book pro running Mac OSX 10.4.5 2 gig memory and an Mbox 2 with Protools 7. I know it is old but would like to run it as is before I can upgrade some time in the future.
Everytime I open protools a greyscreen comes down and am asked to restart computer. Mbox 2 light does not come on and message says contact supplier to get an upgrade before I can get into preferences. Any advice? it would be appreciated and if I am in the wrong forum please redirect me.
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