Problem is that the screen works occasionally but usually it doesn't turn on. Light of the keyboard and the led wich reports of charging are working normally.

it is weard that it may work normally until you reboot it.

Another problem is that my computer which has winxp 32bit doesn't recognize the phone so i can't flash it and test is the problem on software.

• Has this device been overclocked previously?
• Have you submerged the device into any form of liquid regardless how minor it is?
• Have you dropped your device before? Even minor drops or dropping the device onto a soft surface.
• Have you installed any other OS apart from maemo? this includes nitdroid and meego.

It has suffered little water damage but it worked after that few months.

When your device has gone through little water damage, did you strip the device apart and tried to dry the internals of the device as thoroughly as you can before re-assembly and turning the device back on again?

You do realise that the device may work for certain amounts of time even after maybe a few drops of water through the keyboard, etc. It heavily depends on which components has water or liquid on them which may short circuit eventually and fail to work.