So i was using my black berry and i took out the bat and sim card and put pluged it in to my pc with usb. I unpluged it and ,now its a screen of a battery with a red slash going in to it.When i tried to take bat out and put it in it blinks one red light then stays in the battery screen.
someone helpme .its 8300 and it was just recently whiped.

Welcome to the BBForums.

That symbol indicates no battery. Either you have not placed it back in the housing correctly, or the battery is dead. Before any drastic measures, plug the device in a charger for a couple hours, AFTER making certain you have inserted the battery completely and correctly.

Battery was full right before this happened. It was plugged in to my pc with usb , then i just unplugged it and it went straight in to that screen. Now when i take the battery out and put it in , the phone automatically comes on and goes to that screen.

Wipe and reload the OS.
How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
What to do next if Jl Cmder will not connect and wipe - BlackBerryFAQ

Good luck.

ok i was reading the instructions and had my BB pluged in , when i was downloading the OS i remembered that i don't have a Sim card in , and im like ok lets put one in. SO while its plugged in i take out the battery put in a sim card and and the my battery all while its plugged in and bammm! $%^$ came on fine. like nothing happened.

Well good to hear, sounds like you battery was not in correctly in the first place.

no it was in correct. it only fits in one way.