Hi everyone,I am new to this so please forgive me any mistakes I may make.Early 2008 Mac Pro desktop installed ML ok but next day nothing, reinstall ok restart same problem ML installer remains on my  snow leopard disk. Any help appreciated.Kind regards

There I go first mistake straight off. I was wondering how to fit my big long problem in. My fault I am sure but if anyone can help please.
Early 2008 Mac Pro Desk Top, 2 hard drives 1)snow leopard, 2)lion.
I have downloaded Mountain Lion usuing disk 1,selected no.2 as my destination, installed ok everything fine, set my startup as no.2 in preferences, switch off. Next day start up - nothing, my only way to get moving was physcally remove disk 2, and let snow leopard restart.
Reinstalled, everything fine, then same problem on restart next day, remove disk,and so on.
The mountain Lion installer remains in the snow leopard dock.
I know the problem is me, so if anyone is kind enough to be able to offer a solution it needs to be in easy speak (press button a, press button b) because I am not that savvy.
my best regards to all, and thank you.

Where did you get Mountain Lion? Did you download the 4+ GB file from the App Store? If so, then I would try doing the following:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your second drive on which Lion is installed (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
Install Mountain Lion
Double-click on the Mountain Lion Installer application in your Applications folder. Follow instructions to install Mountain Lion on your old Lion drive - Drive 2. When the installer finally finishes it will restart the computer automatically from Drive 2. At this point there is no need to change the Startup Disk unless you want to boot from your Snow Leopard drive.
You will startup to the Setup Assistant in which you will configure your own admin account. You can, if you want, omit that part and instead choose to migrate your Home folder and other data from the Snow Leopard drive. I would recommend you do that unless you wish to do it manually at a later time. In this case create your new admin account using the exact same username and password that you now use on your Snow Leopard system.

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