Cannot detect harddisk on Dell Inspiron 14R N4010

Hello guys.... Please help my problem... I was working on this 2 days and still can not solved the problem, i searched on the internet also could not find the solution... First when the electricity is off while i back the data up to my external harddisk, my ext HD still plugged to my laptop and i was playing games and suddently the elcectricity is on again so my external HD automatically was read by my laptop and making my game lagging.... So i was trying to go out to windows by pressing ctrl + esc when i was on windows and trying to 'safety remove' my ext HD but not succesfully safety remove because my computer became so slow and i wait so long for the 'safety remove' option come out. At the end i decide to press power button and boot in windows again but my windows became slow... Press windows logo on the keyboard, it did not come out and no response so i press the power britton again and boot in safemode to scan disk and i restarted. The scandisk process run half way i think because i close the lid when the process was running and i went out bring my laptop but i dont have chance open my laptop again and when i was back home i recognize the battery was empty, the battery indicator is red colour. Usually if i close the lid while on windows, it will became standby, but i dont think it will standby when the scanddisk process was running. And the problem was starting... I could not boot in windows so i did search on internet what causes the problem... On BIOS menu for 'Fixed HDD' is none, that means my HD was not detected right? So i tried to change the setting for 'Sata Operation' from AHSI to ATA (internet said that), and it worked, on BIOS for Fixed HDD detect TOSHIBA MK3265GSX-(S1) with HDD sice 320gb, eventhougt i change the Sata Operation from ATA to AHSI it still detect my harddisk, so i save the bios setting with sata operation AHSI and the laptop was trying to boot in windows but the error message came out said "SMART Failure Predicted on Hard Disk 0: TOSHIBA MK3265GSX-(S1). Warning: Immediately back-up your data and replace your hard disk drive. A failure may be immninent. Press F1 to Continue". If press F1 to continue, it will give us chance to press any key to boot from cd (cd rom). Press F1 continue with out boot from cd, the are two option come out, 1. Windows startup repair 2. Start windows normally. If choose 1, it was loading something and some screen is come out but the are no text come out at all even i wait so long. If choose 2, it will off and start from the beginning again. If boot from CD and we were trying to install fresh copy of windows, it did not detect the harddisk, so there is not any drive detected on the list. So how now?? Please help, i dont know how to solve the problem. Desperate :(. sorry if my english is bad and sorry for long explanation. Any part was confusing please ask me again. Thank you Waypin