I use a Dell Inspiron N5110 and it slipped from my hand and fell down. Since then when i boot the laptop it makes a beep sound and the screen goes blank and the windows wont load. I have done the diagnosis and it is showing there is a problem in hard disk and fan. I repaired the fan but the hard disk problem pertains. I want to run the laptop using an external hard disk temporarily. Please explain in detail to do the same.