computer wont go to sleep?

Ever since I upgraded my graphics card from gtx 780 to a 780 ti, it doesn't go to sleep on it's own. Can someone help me why this happens and how to fix it please? The monitor turns off after 15 minutes but the computer keeps running even though the settings is after 15 minutes sleep mode. Could it be because I installed the 780 ti and it messed with power settings?
my pc specs: https://imgur.com/a/OaR17
Reply to baraka775
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