Your VAIO failed to start Windows, and the answer depends on where it stops. Start with the quick boot checks, then use Windows Recovery Environment for repair, restore, reset, or reinstall options.
The goal is simple: rule out the wrong boot device, confirm the internal drive is visible, and use the right Windows repair tool before you send the machine in.
Unplug external devices first
This fixes VAIO startup failures caused by the computer trying to boot from the wrong device.
Shut down the VAIO completely.
Disconnect USB flash drives, external hard drives, optical discs, docks, network boot devices, and any hardware you added recently.
Turn the VAIO back on and check whether Windows starts normally.
Check whether the internal drive appears in BIOS
Use this when you see Operating System Not Found, Missing operating system, or the VAIO still will not move past startup after external devices are unplugged. If the internal SSD or hard drive is not detected, Windows recovery tools cannot fix the startup failure.
Power the VAIO off.
Press the power button while holding F3 or F4 to open VAIO rescue mode. On VJZ12A* models, VAIO uses a volume button instead of F3 or F4.
Select the BIOS settings option.
On the BIOS main screen, check whether the hard drive or SSD size appears.
If it shows None or 0GB, stop software recovery attempts and contact VAIO support or arrange repair.
Open Windows Recovery Environment
Windows Recovery Environment is where the main Windows startup repair tools live. You can open it even when the VAIO never reaches the sign-in screen.
Start the VAIO and wait for the Windows logo or manufacturer logo.
As soon as the logo appears, press and hold the power button until the device shuts down.
Repeat that interrupted startup once more.
Turn the VAIO on a third time and wait for Automatic Repair.
Select Advanced options when it appears.
If this method fails, use Shift + Restart from the sign-in screen or Start menu when you can reach it, then continue from the Choose an option screen.
Run Startup Repair
Startup Repair is the first tool to try inside Windows Recovery Environment.
It handles boot configuration, driver, registry, and system-file startup problems. From Windows Recovery Environment, select Troubleshoot > Advanced options > Startup Repair.
Select Restart and let Windows attempt the repair. If the VAIO returns to the same startup failure, go back to Advanced options and use the restore or update-removal tools next.
Use Safe Mode for driver or app trouble
The most common reason to use Safe Mode is a driver or app problem after Windows starts partially but will not load normally.
Enter Windows Recovery Environment and select Troubleshoot.
Open Advanced options.
Choose Startup Settings.
Select Restart.
After the VAIO restarts, press 4 or F4 for Enable Safe Mode.
Press 5 or F5 for Safe Mode with Networking.
Press 6 or F6 for Safe Mode with Command Prompt.
Undo a recent Windows change
If the VAIO stopped starting right after an update or system change, use the rollback tools before resetting the PC.
- 1.Enter Windows Recovery Environment and select Troubleshoot > Advanced options.
- 2.Choose System Restore, select a restore point, optionally select Scan for affected programs, then select Next > Finish.
- 3.After System Restore finishes, select Restart.
- 4.For a recent Windows update problem, return to Advanced options and choose Uninstall Updates.
- 5.Select Uninstall latest quality update or the available feature-update uninstall option, then follow the prompts.
Try Quick machine recovery on Windows 11
Quick machine recovery applies to Windows 11 version 24H2 build 26100.4700 or later, and it works only for known widespread boot issues that Microsoft can remediate through Windows Update.
Enter Windows Recovery Environment.
Select Troubleshoot.
Open Advanced options.
Select Quick machine recovery.
Connect to Ethernet or supported Wi-Fi when prompted.
Let Windows check Windows Update for a remediation and restart if one applies.
After Windows is bootable, open Settings > System > Recovery, select Quick machine recovery, turn Quick machine recovery on, and turn Automatically check for solutions on if you want Windows to check automatically.
On school or work VAIOs, ask your IT administrator if Quick machine recovery or Windows Update repair options are missing.
Reset or reinstall Windows when repairs fail
Resetting or reinstalling Windows is the bigger move for a VAIO that still cannot start after Startup Repair, System Restore, update removal, and Quick machine recovery. Depending on your choices, apps and settings can be removed or reset, and a clean install can remove personal files, apps, settings, and manufacturer customizations.
From Windows Recovery Environment, select Troubleshoot, then Reset this PC.
Choose whether to keep files or remove everything, then follow the on-screen instructions.
If you already created a recovery drive for that VAIO, boot from the USB recovery drive.
In Windows Recovery Environment, select Recover from a drive.
Choose Just remove my files or Fully clean the drive, then select Recover.
If you need Windows 11 installation media, create it on a working PC from Microsoft's official Windows 11 download page using Create Windows 11 Installation Media.
On the VAIO, boot from the USB or DVD.
On the first Windows 11 Setup screen, choose your language and other preferences, then select Next.
Choose your keyboard settings, then select Next.
For repair options, select Repair my PC, then select Next to open Windows Recovery Environment. For a clean install, select Install Windows 11 on the Select setup option screen instead, then follow the prompts.
If this method fails because Windows setup or recovery cannot see the internal drive, stop and use VAIO support or repair service.
Get VAIO support for hardware-level failures
Use this route when BIOS shows the HDD or SSD as None or 0GB, when Windows recovery or reinstall cannot see the internal drive, or when a BIOS or power-on password blocks startup and identity verification is required. Those symptoms sit beyond a normal Windows boot repair.
Use VAIO support, Warranty/Repair Information, or Customer Support for current VAIO PCs.
After Windows is bootable again, download only model-specific VAIO drivers, firmware, BIOS, chipset, storage, graphics, or VAIO Control Center updates listed for your exact model and operating system.
Apply those updates only when Windows is running and power is stable.
Frequently Asked Questions
Why does my VAIO say Operating System Not Found?
The VAIO may be trying to boot from external media, or the internal HDD or SSD may not be detected. Unplug external devices first, then check BIOS to confirm the internal drive size appears.
Can Startup Repair fix every VAIO boot failure?
No. Startup Repair handles boot configuration, driver, registry, and system-file startup problems. It cannot fix a drive that BIOS reports as None or 0GB.
Will Reset this PC delete my files?
Reset this PC lets you choose whether to keep files or remove everything. Apps and settings are removed or reset depending on the option you choose.
When should I reinstall Windows on a VAIO?
Reinstall Windows after Startup Repair, System Restore, update removal, and available recovery options fail. Use Repair my PC first if you want repair tools from the installation media.
