Hi,my laptop is stuck at Dell logo screen,even progress bar is not moving further at all.I tried to hit f2/f12 key but nothing is happening.I gave my laptop to technician l,he reset the bios and laptop started but some keys were not working.So I again handover the laptop to him.But same thing happened,it stuck at Dell logo screen.He told me to replace BIOS cell.Is it really BIOS problem or can it be another? Please suggest.Thank you!