Vostro V131 does not come out of sleep mode.

I have a Vostro V131 closing the lid and then go back to open it up, the laptop has went into
sleep mode. Just see a black screen and hitting enter or any key does
not work.  I know about these steps:

• Log on to your computer as an administrator. Click on Start, go to Control Panel -> System and Maintenance -> Power Options.

• Click on Change plan settings for the currently active plan.

• Click on Change advanced power settings link.

• In the “Power Options” dialog box’s “Advanced Settings” tab for the active power plan, expand Power buttons and lid.

• Expand Lid close action.

• Change the value to Do nothing for “Lid close action” by selecting a new option from drop down menu for both On battery and Plugged in

I rather use the sleep mode.  I have also updated the BIOS and that did not work.  This is a Windows 7 Home Premium. I had called Dell  Hardware Support and  they said this is an OS issue.  Any suggestions or tips will be greatley appreciated.