Try starting from scratch. Unplug your devices, wait 10 seconds, and plug them all back in. Once all of your devices are back up and running, try loading Netflix again. If it still isn't working, you'll want to try a speed test on your computer, which you can do at speedtest.teksavvy.com.
If your speeds are fine and you are using a VPN service such as Unblock-US, please try following their support guidelines as additional steps may be required.
The following are the speeds with which Netflix will function.
1 Mb/s for viewing low resolution videos on a computer (this may be very grainy)
2 Mb/s for viewing standard definition video on a TV
4 Mb/s for viewing High Definition video
5 Mb/s or more for the best audio and video experience
If your internet isn't the problem and you've addressed other concerns such as VPNs, try going to https://support.netflix.com/en/node/461.This site will walk you through troubleshooting procedures which should help remedy your issue.