Have the HTS3400/37 as well. Makes a low gaslike noise when plugged in and power pressed on. Noise located near board where power feeds. I try to shut off and remove plug the standby light remains on for 5+ seconds. Believe to be capacitor. Fixya.com also spoke of this product and issues. Also, had "DVD not found" issues prior as well (too frequent-clean/new DVDs). Anyway u look at it. Not good. Darn shame.
acx21, July 2009