..so wen it says press power button while flashing it doesn detect d power button wen i press cos my phone doesn turn on..
You aren't to touch the phone at all.
If you aren't getting this dialogue, why don't you post screenshots of what you see on your screen:
Press
PrintScr (which is to the right of F12) then open an image editing program and
Edit > Paste.
If you post an image, it is more helpful.