Open Question: when i change a setting, restart and nothing changes?
OK, i just noticed you mentioned not being shut down properly, so you want an answer to get it back to booting normal. If you have the Windows CD boot it up and choose r for repair. Then choose 1 when it ask what windows, then type: fixmbr, press enter, answer yes, next screen type: fixboot, press enter, answer yes, next screen type: exit and remove the CD before it boots back up. This only fixes the boot sector of the hard drive. Some time this will get the computer to boot back into the Windows the normal way. This may not be the answer but it is a starting point.
Open Question: please help me!! i dun know where is the restart button of my hp mini 210 series?
If you don't like to press the shut down button to shut your HP down, just go to start menu and select "shutdown". Or… click on your desktop, then Hold down the Alt key and press F4, and select Shutdown.
Additionally, you may set the shut down button to tell your computer to shutdown/sleep/hibernate/do nothing by go to Control Panel, Power Setting, and change the "what does the power button do" (or something like that) option if you are running Vista or Win7.
Hope it helps you a bit.
