Power levels are only one factor that need to be checked.
Large pictures may not upload correctly, and in any case need to approved by a moderator before they can display. Post just the text using cut and paste, but remove anything private like IP or MAC details..
To check your power levels, go to http://192.168.0.1
Click "Router Status" at the top-right, then click on Downstream. You'll will also see upstream
Post a screen shot of the results here if needed