you know francoiste I have been having the same blue screens that you had and once in a while the screen freezes with a few lines on it. Now i havent had a blue screen in a few hours, but earlier today I had like 5 and always kmode exception, driver
irql, etc... you know what they are because you had them too, and my memory is also checking out ok on memtest. Maybe i should just buy new memory stick but i cant open my computer because i have 39 days left on my warranty from hp and they said if i open it they will not fix it for free... so that is why i cant check out my ram sticks but from what you wrote I really think that i may have a similar problem, the ram came in the computer and they are only 8-9 months old, but i wonder if some dirt or heat in there caused something to happen or maybe one of the sticks is loose or the contacts are dirty. I will let you know what happens!
its weird that now im going for over 4 hours and earlier today i had 5 blue screens in a row then i did a system restore, plus i REINStalled windows 7 yesterday from the 3 dvds that hp sent me and was doing good until today, cpu on all night without a problem then today i got one and 5 more then i do system restore and now ok, so maybe its not my ram it may be an update that was downloaded after I system restored to but if i get another blue screen I will check my ram physically if HP lets me open it up thanks man