Question Changed my refresh rate from 60 to 75 now it says no signal ?

Dec 27, 2020
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Hi,
Today i turned on my pc as usually and my screen resolution was 1600x1050 which is my usual when i don’t game. But when i do i change it to 1280x1024 because i can get 75hz that way. Today i went to do the same except when i changed it to 75hz my pc just turned off. And it wasn’t a classic crash, this time my monitor turned off firstly then my pc seemed like it was turning off one thing at a time. I have tried plugging the pc onto my TV with HDMI cable to see if it’s the monitor but when i did that still it said no signal. I tried removing the ram sticks, didn’t help. When i turn on the pc i can still hear the sound and my keyboard and mouse seem to work, all fans are running. Please help.
 

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