Often my screen goes blank or into sleep mode even after seconds of use.I have to reboot and sometimes reboot more than once to get a pic

My monitor will go to blank screen for no reason....and I cant get it back without rebooting sometimes 3x.
I tried various monitors...same problem
New video card?

My monitor will go to blank screen for no reason....and I cant get it back without rebooting sometimes 3x.
I tried various monitors...same problem
New video card?

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