Installing OSX lion has caused my Macpro problems on startup

Since I installed Lion a few days ago  I am  getting an intermittent blinking of the power button light when I startup. Sometimes it starts up, sometimes it just  blinks,  and then I hold the power button till the computer turns off. Then when I try to start up again I hold the power button till I hear a long sound and a chime. Then it starts up, but only if I do that process. What could be going on? It hasn't done any of this kind of behavior till I installed Lion. I tried running disc repair and permissions repair from start up on another drive, but it does the same thing when I try to restart in that drive. Also a side question; is a download for lion from the app store only good for one installing on one drive? I tried to load lion on my back up Lacie one terabite drive but it wouldn't install.

Might be coincidence, might be a change in the power-on self test, might be something else entirely (though I don't know what.) I suggest you take the machine to an Apple Store for testing.

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