Jannah Milcah Agbayani

Why does my Galaxy Tab 2 7.0 say “Downloading. Do not turn off target?

12 May 2013
Windows
Chrome 26
12 May 2013 | Windows | Chrome 26

My galaxy tab 2 7.0 wont turn on. I tried the holding the power and the volume button. It worked but I accidentally pressed the up volume and now the screen says “Downloading. Do not turn off target” What am I gonna do? Please help me :( I dont wanna lose my tab!