I can't fathom how even a 1050 (non-Ti) could be at 45C under load. That GPU isn't great, but a "load" temp that low suggests it's not being used.
Do you have the monitor cable (HDMI presumably) plugged into the GPU or the port cluster on the mobo by the USB ports and such?
First step in resolving the CPU temp issue. Figure out what fan header you plugged the pump into, locate that header setting in the BIOS, and make sure it's set to constant 100% speed. If that doesn't help, the next thing to check/ fix is thermal paste application (probably too much) and bolt tightness on the pump.