Samsung monitor working well only sometimes

I have Mac Mini 2011 with the Samsung SyncMaster T24B350 monitor. Sometimes it works well, but also sometimes I have problems for starting up the machine. The image appears to be stripped and distorted. It fixes sometimes when I restart the machine, but sometimes I must restart it three or four times until it gets functioning well.
I tried all the configurations: the PC cable, the HDMI cable, and the problem continues to appear.

Tr resetting the VRAM
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