Intermittent loss of screen display on boot-up

I have a HP G70-110EA laptop, running Vista.
During the last month or or so there have been 3 or 4 random occurences of the folowing problem:-
When the laptop is switched on, the screen lighting comes on, but otherwise the screen is blank (blue, NOT black). The HDD light flashes and after a few seconds there is the audible bleep for the BIOS password. Enter password at the keyboard and the HDD light continues to flash. As far as I can tell the boot process is continuing normally all the way to the Windows login screen, except that nothing appears on the screen at any time. If the laptop is powered down, and then turned on again, usually everything is back to normal, except that today it took 3 or 4 attempts. Once the screen functions normally, then it /seems/ to continue OK until you shut down again - even if you go into sleep mode during your session, it will come back again alright.
I think - but I am not certain - that the first time this happened was after it had downloaded and run some Windows updates, and was then re-booting.
Is this a hardware or software problem, and what might be causing it ?

Thanks for the link. As far as I can tell at the moment, there is nothing in any of the linked pages to cover my particular circumstances, for the following reasons:-
1. A lot of the help is for cases where the laptop does not boot. It is clear that my laptop DOES boot, you just can't see anything on the screen!
2.  Some of the help relates to black screens. I get more of a 'dark blue' screen , as it is clear that the edge (?) lighting comes on and the screen is certainly NOT the black that occurs during normal boot-up.
3. If there ARE any error messages, they do not display and therefore can not be read.
4. Trying to do thing such as read the number of LED code flashes is difficult, as it takes a little while before you realise that the screen is not going to display, by which time the POST process has passed.
However, if/when the problem re-occurs, then I will certainly cross-check with that information.
Might it be something as simple as an intermittent fault in the screen cable where it passes through the hinge?

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