Hi all,
I have the following problem with my HP Pro All-in-One 3520 Business PC:
when I turn it on, one of two things happens:
- either it boots up without any problem and I can use it, restart it, and shut it down without any problem;
- or it boots up (I hear the fan and harddrive) but the screen stays blank. Funny detail: when this occurs, the usb-connected keyboard does not work - like it is getting no power. None of the lights (scroll lock, Caps lock) work. The mouse (laser mouse) however does get power.
When I unpower the unit for a while sometimes it work rightaway, sometimes I have to press and hold the power button several times before the screen (and keyboard) works. There are also times when it just does not work at all and I have to wait to see if it works the next day.
I have removed and changed the CMOS-battery and checked all the cables. The thing that intrigues me the most is that it seems almost random whether it works or not. And when it works, there are NO problems whatsoever.
Any idea what might be the problem? Anyone have the same problem? The unit was bought 1,5 years ago so is out of warrantee.