option command does not bring up Yosemite upon restart while in Snow Leopard mode
My imac which has been a splendid machine is getting long in the tooth. Until i can afford a new machine I need to have 2 OS to run the software. I have 2 partitions one of which is running the last OS that will run my photoshop. That OS is Snow Leopard. The big partition is 800 Gig the smaller is 100 Gig. Because one needs to rebuild directory Disk Warrior demands a separate startup. Thinking that Yosemite or indeed the latest OS would be good to have in order to run latest version and do Disk Warrior rebuild.
So my desire is to be able to be current within the Mac OS community but i am finding it difficult because Snow Leopard does not recognize Yosemite (or indeed whatever is the latest OS). Now i have 2 needs. And soon i will be forced to upgrade to latest Revit. So i will have to erase all my disk after backup files and resize the partitions one smaller with Snow Leopard but the other for running Revit thru parallels will be bigger maybe 700/300. Then i will do bootcamp.
Now before the big switch i wanted to see about the current OS but i cannot find how to restart and see the partition. I got a nice suggestion to do option + command (he actually said alt) but this doesn't work. So any ideas?
My needs
1.) I must run Photoshop and parallels with Revit running Windows 8 for my lifeblood $$ income
2.) I will be moving on and adding new Revit to see if running bootcamp makes it faster until i can buy a new machine (it is looking more and more like it will be a windows one as apple is clearly blowing it with their lack of smart moves lately. No DVD drive? Dumb. Inability to choose an OS when restarting not helpful. No disks sent when purchasing new OS, unfortunate and this reliance on cloud is asking for trouble.
Mahalo for your considering my dilemma. . .
iMac (24-inch Early 2009), Mac OS X (10.6.8), Snowleopard + Yosemite partitions