Satellite P505 black screen only on startup

I know there are a lot of black screen posts but I cannot find anything with quite the same problem we are facing. We have a satellite P505-S8980 that only has trouble booting after it has been turned off for the night (or at least a good few hours). No problems with sleep, hibernate etc.
The system boots, we see the Toshiba screen, but where the login screen should be is a black screen with no cursor. An external screen plugged in shows the login screen. After 3 or 4 restarts the screen works as normal.
Have tested the memory and the hard drive extensively and they also work perfectly in another P505. Any advice would be very much appreciated, the machine is great apart from this new problem.
Thanks for your time.

Thanks Peter for your reply, I have been through both of those links before without any luck.
We have done a complete factory restore on this computer, tried the bios reset and all other listed suggestions. There doesn't seem to be any error associated with this, as windows actually starts, then the screen goes black at the user login page.

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Message was edited by: Lindberg

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