My blackberry always restart. And, when It turn off, I plug it into computer. I didn't see red light, just only green light.

Have you dropped it or gotten it wet?

may be I had it wet? but jut a little. when I turn it on, it noticed that: "battery drained". what should I do, dc/dc?

It doesn't take much moisture to cause problems. Sometimes the device can be recovered if the battery is removed right away and the device is dried thoroughly before the battery is put back in the device. Once the damagae is done, however, there is really nothing you can do because the device is totaled.

My advice is get another BlackBerry.
Posted via BlackBerryForums.com Mobile

This is definitely what you should do.

tks you all, guys!