Microsoft Xbox 360 Controller "playing power went" Questions

...went to my friends house and i brought my controller to play with him then i was first player on his consle and he was second so we played and then when i got home i could sync my wireless 360 ...

playing L4D on my computer when it suddenly crashed, and then the screen turned black. So I restarted my computer, except after a few minutes the screen turned black again (I did not open up any games

...went out and spent a small fortune on some Energizer Ultra+ batteries and again same problem. Help, I now have a draw full of batteries! : ) you need to push the sync button on the xbox and then on ...

...playing my xbox360 the power went out and it shut off when i was playing it i was using my wireless controller and it would not work it just kept on blinking........i dont know what happened... YOUR ...