Sorry to here about the loss... With 30 years in the electronics field, I've seen my share of lightning and surge damage. Lightning and surges behave in unexpected ways and do strange things to electronics, sometimes obvious and othertimes not. More times than not, the damage is caused from an inductive surge induced into the system rather than by a direct strike. As mentioned in another post, the lingering effects can hurt you the most. If the motherboard indeed has visible damage, I would replace the entire computer. To help reduce the possibility of this happening again, I would suggest the following: Make sure all interconnected equipment is on the same leg of the incoming AC line. Have a surge protector installed by a licensed electrician at the AC panel protecting both legs. Make sure you have additional surge protection on everything. During a storm, unplug your modem and LAN cables if used. During a storm, if you unplug one piece of gear from AC power, unplug it all. A disconnect box works great for this. Flip the disconnect and everything is isolated from the AC line. Finally, don't use ground lift adapters. Probably not what you want to hear, but I hope this helps... Jack