Screen freezes after login on Lion OS X (intermittent)

Ever since upgrading my MacBook Pro (purchased Apr-10) from Leopard to Lion I'm experiencing an intermittent problem where the screen freezes once a user has logged in. The problem only occurs when the machine is started from off and doesn't occur when starting from sleep or when switching users.
This problem affects all users set up on this machine and results in a cursor that can still be moved but can't select anything and a keyboard that is unresponsive. Most times the cursor shows as the coloured wheel. I have left the machine in this state for over 30 minutes to see if it would recover but it doesn't and I have no option other than to perform a hard reset by holding down the power button. Sometimes it can take a couple of hard resets before the machine recovers.
The configuration of my machine is fairly straight forward with an Apple Time Capsule providing backup and WiFi and minimal software installed.
I have found that disabling all 'Open At Login' apps reduces the likelihood of the problem but doesn't cure it.
Has anyone else experienced this problem and can provide a solution as I want to avoid having to revert to Leopard if possible.

Accelerated Video Drivers for the 5770 and 5870 first appeared in 10.6.5, so when running 10.6, be sure to update to at least that version before drawing conclusions.
Otherwise, I think your conclusions that this is a graphics card problem are likely correct. Over a very large sample, these cards have been much more reliable than many previous cards. But you do not have a very large sample, you have one card.
The Mac Pro (65lb tower) uses Error Correcting Code memory, so this is NOT a RAM memory problem or you would be getting kernel panics with machine check, uncorrected error.
Apple hardware test is a tool that only seems to detect the grossest of errors. It is famous for false negatives.

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