Not possible!, unless I seriously POed a GF and she went Commando on all 5 of my PC's short of that its a near impossibility for all 5 to fry completely at the same time.
The first gen 360's had [censored] processors and constantly would just fail -> the price of MS trying to lower prices with substandard components.
ALSO
MS and Sony both use cheepest thermal paste in existence and after 1-2 years of normal play both the PS3 and 360 fail routinely from their heatsinks becoming detached from their processors which causes the systems to turn on their death lights -> Blinking Red/yellow (PS3) This has happened twice to me and the Red Ring of Death (360) has happened 3 times to me.
That is not true I fix 360's constantly with the thermal paste issue = the more you use it the faster it breaks down, same can be said for PS3's but they generally last longer then 360's before it becomes an issue.
Either way the fix is to take it apart, clean any dust out and re-paste the heatsinks to the processors costs all of 10-25$ depends on where you get the paste just make sure you buy heavy silver content paste and not the ceramic/offshoots stuff as the these pastes do not work well on the consoles as they generally run 2-3 times hotter then pretty much even the hottest PC's.