it happens at startup that the screen resolution change to lower, all images are out of sink, sometimes restarting fix it, some othertims I have to go to problem fixing, and sometimes I have to go to work on it long time.
Thanks in advance

PC SPECS
W8.1 NS: 00258-61743-32505-AAOEM
LENOVO-PC2
Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz, 3201 Mhz, 4 core, 4 processori logici X64
BIOS LENOVO IEKT26AUS, 22/07/2014 - SMBIOS 2.7
(RAM) 4,00 GB
Windows 8.1 Versione 6.3.9600 build 9600
NVIDIA GeForce GTX 745
Realtek PCIe GBE Family Controller - Ethernet 802.3
CHKDSK C: /spotfix
NVIDIA - Display - 12/29/2016 12:00:00 AM - 21.21.13.7654