copied this off dell's website for resetting your bios.
Unable to power on or complete POST (Power On Self Test)
If your Dell Inspiron 5000 series laptop PC is unable to power on or if the PC is unable to complete the POST process (Power On Self Test), use the BIOS Recovery options on your PC.
Before you begin BIOS Recovery, ensure that the laptop's battery is charged up to at least 10% and disconnect all external peripherals connected to your PC like USB flash drives, USB external hard disk drives or printers etc,.
- Verify that the laptop is powered off and disconnect the AC adapter.
- Press and hold the CTRL + ESC key on the keyboard.
- Plug in the AC adapter to the laptop.
- Release the CTRL key and ESC key on the keyboard once you see the BIOS Recovery screen.
- One the BIOS Recovery screen, select Reset NVRAM (if available) and press Enter key.
- Select Disabled and press Enter key if you wish to save the current BIOS settings.
- Select Recover BIOS and press Enter key to start the recovery process.