1.Have you made any changes to your computer prior to this issue?
2.Do you receive any error message along with the error code?
3.Are you able to start your computer to desktop?
4.What is the make and model of your computer?
A "Stop: 0x0000007B" error message indicates that Windows 7 cannot access the hard disk that contains the Windows7 startup files. Typically, this Stop error occurs when Windows 7 cannot locate a compatible driver for the disk controller device. For example,
this Stop error can occur if Windows 7 cannot locate a compatible driver for a RAID controller.
You may also receive this error message if one or more of the following conditions are true:
• The hard disk is faulty.
• The hard disk cabling is faulty, or the hard disk cabling is not connected correctly.
• The computer is infected with a boot sector virus.
• The computer BIOS or the disk controller firmware are incompatible with Windows Vista.
• Another program is using the master boot record.
Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps
carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the windows help article below.
Back up the registry http://windows.microsoft.com/en-us/windows7/Back-up-the-registry
You may refer the article and then check.
Error message when you start a Windows 7 or Windows Vista-based computer after you change the SATA mode of the boot drive: "STOP 0x0000007B INACCESSABLE_BOOT_DEVICE"