Windows 8.1 Pro locking after 5 minutes

I have a client who has five workstations on a domain, all workstations are running Windows 8.1 Pro. One of the workstations is auto-locking after 5 minutes of non-use. I have checked the following: screen saver, power options, and GPOs. None of the settings are setup for auto-locking after 5 minutes. Has anyone else experienced this? Any ideas are greatly appreciated.

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The steps you've taken are some where this info is set.
When you say lock, is it on OS level, or the screen turns off?
YortAuthor Commented:
@arnold - The OS locks and the screen stays on.
Locks meaning becomes inoperable or requiring credential to regain access?

What are the settings that you found in the places you looked?

What model hardware, check whether power saving is not part of the how bios/uefi.
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YortAuthor Commented:
@arnold - Screen save is set to (None), Power Options are set to 'Performance" - with display and sleep set to Never, under advanced power options all setting are set to Never. Haven't looked at the BIOS yet.
JohnBusiness Consultant (Owner)Commented:
Open Task Manager and set the option to Hide When Minimized. Minimize it. It should be DARK green.

When it locks up, does it change (has it changed) to BRIGHT green?

On the problem computer, open cmd.exe with Run as Administrator and run SFC /SCANNOW. Allow to complete, shut down, start up and test again.

Scan for viruses: your AV application and Malwarebytes.
The answer to @arnold question seems to be the important one, and wasn't answered by asker yet.
Let's just assume it's a NORMAL WINDOWS LOCK (back to log in screen). That's EXPECTED BEHAVIOUR.
It's called the console lock (for safety, obviously). To disable it (or just up the minutes), you have to reveal this option in the power settings:


Attributes DWORD

1 = Hide "Console lock display off timeout"
2 = Show "Console lock display off timeout"

Set it to 2 obviously. Then after a reboot, the Console lock display off timeout option can be found in the advanced section of your power options (under the + Display option).
YortAuthor Commented:
Everyone - my sincerest apologies for the delay in responding. I truly appreciate everyone's efforts in helping me resolve this matter. To clarify, the exact issue that was happening was the workstation would return to the login screen after five minutes of inactivity. The resolution was to reset the Security Policies (Control Panel > User Accounts > Reset Security Policies). The Rest Security Policies doesn't always appear in Control Panel > User Accounts; it will appear only if some action taken on the machine has affected the Security Polices. I do not know what actions were taken on the machine that caused this issue (it all happened prior to me taking on this client). Research shows it could be the addition of an IMAP mail account, etc.

Edit - this is where I found the solution that worked for me:

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