iam no expert but working in the office machine service industry for many years,I found most circuit boards blown by brown outs (what we called power fluctuation in Canada) with power surges sometimes just a fuse in the power supply of the equipment was blown. Seems power fluctuation is hardest or most expensive thing to protect against(good UPS). like I said iam no expert and welcome any advice. Would like advice on knowledgible place to purchase electonic equip. protectors?