Did the unit survive the drop test (see left side of casing). Since you are a novice to this game also be aware of the very close proximity of lethal mains voltages to the low voltage DC outputs. You also need to ensure that the mains cables cannot be accidentally pulled out of there connection terminals. One cheap and nasty method would be to loop the cable into a swan-neck and tie-wrap the outer covered cable to the two slots on the casing right hand side.