HT3371 my macbook isn't charging anymore. there is nothing wrong with my charger or my electricity. I think it's my battery. I conducted command+p+r and it help my computer charge up, but now it's not working anymore. what can I do, I have a school compu

Question

School starts in two weeks, so I can't see the technician, until then. What can I do I really need my computer. I've already tried command p r.

Answer 1

Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
    1.    Select Disk Utility from the main menu and click on the Continue button.
    2.    After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
    3.    Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
    4.    Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Kappy, a pretty wonderful and very knowledgeable man, has tip for that which I have copied and pasted above