Why doesn't my built in display re-initialize after resuming from sleep mode?

Hi,
I have a MacBook Pro (2.53 GHz Intel Core 2 Duo, 4 GB RAM) which I purchased a few years ago. I always have a secondary display monitor plugged in.
When I bought this system, it came with Snow Leopard and I recently upgraded to Lion. That's when this issue began:
If I physically fold the screen down and put the MacBook to sleep mode that way, often times when I resume my secondary display will return but my primary built in display will not - it just remains black. In some cases this creates a serious problem because my menu bar / dock are still on the main display and so I have no dock.
I notice the problem has not occurred if I put the unit to sleep using the Sleep command... but sometimes I forget.
I am wondering if anyone else is having this type of issue, and if there is a way to solve the issue? Is it possible this is a bug?
Thanks,
Steve

etresoft wrote:
It is definitely not a Leopard bug because it has been happening on every portable Mac I've ever had.
I don't agree. I had no problems at all with my MacBook Pro running Tiger. I initially did an upgrade from Tiger to Leopard and when the problems started I assumed it was a problem with the upgrade. I then completely erased and did a clean install of Leopard. The problem has actually gotten worse since I did the clean re-install.
etresoft wrote:
Just close the screen, wait for it to go back to sleep, then open it again. It will probably be fine.
As I mentioned in my opening post, I've gone through that song and dance more times than I can count. I've closed it, waited for as much as an hour, opened it back up...same problem. I've hard powered it down, closed it, disconnected the AC adapter, removed the battery, opened it, held down the power button for 15 seconds, re-installed the battery, reconnected the AC adapter, pushed the power button, and the display will still be dark. It's sometimes taken as many as 5 or 6 iterations of that process before it will finally reset whatever problem it was having and boot normally with a functioning display.

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