How do I mount my internal hard drive?

Can anyone tell me how to mount my internal hard drive?  I have a macbook air late 2010 model.  128gb flash storage.  I was having problems because it would freeze on me after sleep.  I ran disk utility and repair disk.  It says everything is fine.  But it is unmounted.  Clicking on mount didn't do it.  I already backed it up  before it was unmounted.  I did the hardware test too.  It said there were no hardware issues.  I see the apple brand hd but the "macintosh Hd" is grayed out.  Please help!

Try doing this:
Drive Preparation
1.  Boot from your Snow Leopard Installer flash drive. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
When formatting has completed quit DU and return to the installer.  Complete the OS X installation.

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