I have a HP Pavilion PC (tx2520ea) display issues

Hello
I have a HP Pavilion PC (tx2520ea).
It was originally running Vista but now running W7 (and works fine for years after doing that). No other changes have been made to the system.
It starts up fine and for a moment or two the screen shows the usual boot up options. However after that the screen dies (although I can still hear the fan, suggesting that the PC is running). I cannot get it to to anything else at this point.
I have tried booting and pressing F11 to restore (and also ESC to enter bios and F8). It tells me that it is starting and then the screen goes blank again. I have also tried booting which pressing WINDOWS and "b" to attempt to force a bios restore.
The thing is, I dont think that the screen itself is broken. If I shut the screen and then reopen it again the screen lights up correctly as I would expect, then it dies on me again. This is totally consistent and repeatable.
My thoughts are either there is a loose connection somewhere (this model has a swivel screen) or there is some corruption somewhere perhaps with the computer confused as to when the laptop itself is open or shut!!
Does anyone have any ideas as to what I can do. The pc is several years old so I dont really want to go for an expensive repair. However it seems OK apart from this one issue so I would like to fix this if possible. I dont care if I need to restore it totally however (all my data is safely backed up).
Cheers Paolo

reinstal OS ,,, do a format during instaltion of windows,, hope that will mk everything fine
best of luck
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