Screen went off and go into sleeping mode automatically

[cp1252]

Hi guys

My PC screen went off suddenly and go into sleeping mode automatically. occurs like every 2 hours since this morning and it wont boot up,.i have to press the restart button each time.

attached are files generated by two tools I found in this forum.

 

[HarriePateman]

*** WARNING: Unable to verify timestamp for [COLOR="Red"]nvlddmkm.sys[/COLOR]
*** ERROR: Module load completed but symbols could not be loaded for [COLOR="Red"]nvlddmkm.sys[/COLOR]

[COLOR="red"]VIDEO_TDR_FAILURE (116)
[/COLOR]Attempt to reset the display driver and recover from timeout failed.
Arguments:
Arg1: fffffa80111514e0, Optional pointer to internal TDR recovery context (TDR_RECOVERY_CONTEXT).
Arg2: fffff880062f0ae0, The pointer into responsible device driver module (e.g. owner tag).
Arg3: ffffffffc000009a, Optional error code (NTSTATUS) of the last failed operation.
Arg4: 0000000000000004, Optional internal context dependent data.

please update your display drivers.