Q500 4K q500 4k will not connect to st10+ only blinks white light

The best start would be to run through the Q500 Binding verification document to identify the exact point of failure in the binding process. The process is NOT just a set of instructions. There are some initial steps to create the proper starting conditions. The sequence then falls into a routine of directing an action, then a step to confirm the expected results of the action. When you reach a step that does not confirm the expected result, STOP. Do not continue in the process. Report the step number and what you saw back here to a new post. It will give us a much better chance at finding the problem.
This link leads to a copy of the verification document:
https://www.dropbox.com/s/zdv7qmwdx4mwn2n/Q500 Binding Verification.pdf?dl=0