mi garage door was not closing all the way down so I stared turning the control in the back that said close and all of sudden the garage door stopped working when you push the close and open control button it just blink but it does not work any more then I stared messing whit the up & down screws and now does not work any more the brand is ultra life model 800 if you got any advise I will appreciate it thanks my e-mail is nungo34@yahoo.com