Computer - black screen - have to hard boot

I have a computer - Windows 8.1 - that keeps going black.  I tried undocking it and it freezes with a yellow flashing bar at the top when it freezes, tried replacing video cables, monitor cables, docking station.  I suspect it's a hardware issue because of the flashing yellow bar, but an intermittent one.  The laptop is a Lenovo T Series laptop.  Updates, diagnostics, etc have been run but all clears.  Have not checked the event logs for any errors during the specified time of outage.  Any ideas would be greatly appreciated.
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JohnBusiness Consultant (Owner)Commented:
If the computer is new or nearly so and if you perceive a hardware issue (heat, disk noise), then consider contacting Lenovo support.

For software, and assuming it will run, try the following:

1. System File Checker:

Open cmd.exe with Run as Administrator and run SFC /SCANNOW.
Allow to complete, restart or, preferably, shut down the computer and then start up again.
Test to see if the problem has been corrected.

2. DISM:

Open cmd.exe with Run as Administrator.
DISM.exe /Online /Cleanup-Image /Scanhealth (takes 15 - 20 minutes).
DISM.exe /Online /Cleanup-Image /Restorehealth (takes 15 - 20 minutes).
Restart the computer and test.

If these do not work, you need to consider a Windows 8.1 Refresh or a Repair Install (you need the Windows 8.1 DVD for this).

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Have you ran the BIOS/Hardware diagnostics? this will tell you if anything has failed in the machine.
From the diagnostics you mentioned. Did you also run the bootable Lenovo Diagnostic tooling ?
Lenovo Bootable Diagnostics

Lenovo UEFI Bootable Diagnostics
i would start by updating the drivers for it; usually it is a video driver issue
JohnBusiness Consultant (Owner)Commented:
@jduran04  - Thanks and I was happy to help.
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