I turned on my cellpjone, and its black!

If this is a LCD, you have a failing LCD panel. Typical of older Samsung sets!

when task manager appears on the black screen, click on applications tab and then click new task and type explorer.exe and then press ok. your normal desktop should appear

The problem isn't the battery, it's just the **** phone. You'll have to get a new one.

your battery is dead so you have to put your phone on charger to resolve this problem

try to tap your tv slightly at the side if it go back to normal operation you have a weak solder commonly in the main board try to resolder parts that is slightly hung.

Hi, If it is warm to the touch, and it just shut down all of a sudden, I would say that the motor has an internal over load switch that is normally closed, and opened to stop from burning this vac out. It is a built-in safety. I would look at the roller for anything that may have hung up, but steady use for an hour just over heated the motor. Let it cool way down. Try and start it. Also, check the plug to see if you may have lost power there also. Let me know please so I can be of any help you may need.
Sincerely,
Shastalaker7

it seems it have an internal problem of contact and you must get it repair, or consider buy a new one that model is a little old.

freezedMy HTC was working great!!...sudenly started to freeze and after that just turned off...I try to soft reset it....but it is still hanged how can i hard reset ?it worked at the begining(just for 2 seconds) but later the phone didnt start....and then it didnt continue the starting..sometimes after that just a clear white screen appeared. it freezed again.touch screen not working at all.

How many things are you trying to do at a time? Mine would freeze if I were on the phone, playing a game, and on the internet at the same time. It may be related to the number of programs you are trying to use simultaneously.

This could be a heat issue. Make sure that nothing ( eg dust) is blocking the air vents.