My camera sony cyber-shot dsc-h2 does not switch on when the button is pressed. please suggest solution
I had the same problem.
In another post on this site I read that a stuck lens or bad batteries can cause this. My batteries were OK and it seemed as if the motor or lens gear was stuck.
The shutter could still be opened and closed by pushing power while the lens cap button was either pressed or released.
As I could not move the lens and some soft "shocks" did not release it, I once again disassembled the whole camera. (5th time the last two days...)
Note that for my camera there seems to be some protection mode being activated after a few unsuccessful tries to power up the camera with the lens cap removed.
After this protection was active it was not possible anymore to even display anything until disassembling the camera and pulling some of those internal plugs.
After having removed the lens with moter (without the circuit boardss attached) I used an external DC laboratory power supply set to 2V DC (and with current limitation activated) to directly power the lens motor at its two soldering points at the backside.
First it did not work at all, but maybe because of bad contacts.
But then I managed to let the lens move in and out by reversing polarity of the 2V.
After a few times the lens seemed to move much smoother.
With the lens still out I carefully re-assembled the camera again.
Now everything works fine again.
If you do not have a DC power supply you might be able to put the two batteries in series and apply that voltage to the motor.
Do not use a larger DC voltage than retrieved by those two batteries... or you might damage the motor or lens or...
I am not responsible if you damage your camera...
Be careful with the cables and note that a part of most of the small connectors can be carefully lifted upwards at the end to release the cables !
Maybe this helps to reactivate more of those stuck cameras.
Good luck !