Default galaxy tab gt-p1000 cant boot it hangs on a flashing adroid screen ,cant boot at all

hae , am stuck and i need help ,my tab cant boot ,i cant even boot it into download mode ,when i press power and volume down at the same time it remains black screen, no combination of key is working .even pressing the reset button at the back it boots and then hangs on a flashing adroid screen. please help me, i dont mind lossing my data if only i can get my tab back on working.