I was running water in my bathroom sink the other day and heard a muffled "pop" sound in the wall or under the vanity, then my water pressure went to a trickle and has been that way since. My other sink on the same vanity seems to be somewhat normal with slightly less pressure. Any suggestions?
Thanks, M

Could be the washer on the stop valve came off and blocked the flow. Turn off the water under the sink, remove the riser pipes and then carefully open the stops and see if water is coming out, put a flex pipe on if necessary. If no flow, you need to replace the stop or at least the washer. If you do have flow, it is in the faucet valve.

Thank you so much! We will try that.
Could be the washer on the stop valve came off and blocked the flow. Turn off the water under the sink, remove the riser pipes and then carefully open the stops and see if water is coming out, put a flex pipe on if necessary. If no flow, you need to replace the stop or at least the washer. If you do have flow, it is in the faucet valve.