The issue may be due to any recent hardwrae or software changes and also due to any virus.
1. Remove any recently added hardware/software.
2. Try to boot the computer in safe mode. Press F8 button soon after restarting the computer to enter the advance boot option and select safe mode to boot computer in safe mode.
3. If issue persists even in safe mode, perform a system restore to an earlier time or date when the computer was working as expected. Performing system restore will not delete any data from the computer.
4. Reset BIOS to default values. (Press the F2 key after restarting the computer to enter and access BIOS).
5. Press F3 and F4 keys to reset the BIOS. or press the right arrow key until you reach the exit menu, then select the load BIOS default option.
6. Then, select the Yes option when promted, save the settings and select yes option. restart computer and check.
7. If still persists, perform a system recovery using the VAIO Care Software or the F10 recovery partition.
Note: ensure to backup any important data before perfoming system recovery. System recovery will erase all the data presnt in the computer.
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