Installed Lion on 2008 MBP, Won't Power Up

Istalled Lion today on my 2008 MacBook Pro 15",
4Gb RAM ( Patriot Memory 4GB (2 x 2GB) DDR2 667),
Snow Leopard (latest version).
However, now when I press the power button the computer turns on for a split second and then shuts down immediatley with a *beep* sound.
Battery was fine earlier today, and I have tried taking it out. Laptop is plugged in as well.
I'm not sure how to troubleshoot this as I can't get to any diagnostic tools.

I agree it may well be hard to understand.
But the symptoms you report are consistent with RAM issues. The Mac won't proceed beyond the point you describe until RAM has been verified and baci hardware tests complete - then you get the grey screen..
"Once the screen turns grey the hardware tests are complete, and the Mac looks for a boot volume.  Software now dominates  the startup process. ..."
Which came from here.
Do you have the original RAM that came with the MBP??
If so try re-installing it to see what happens.
If it works well we know what the problem is.
If not, well there is some even more fundamental problem on the logic board.
Steve

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