CPU MB Burn in?

So new guy here looking to learn a lot more about the hardware goodness in PCs and smaller devices.

I got a few questions for some of you more in the know than I; first off do the boards get tested prior to shipping? I have been helping to get the friends and families CPUs in a better state than they are currently in and I have had some durability issues with a few different boards burning out in a few days of use.

Now I of course thought right off the bat that I had hooked up something wrong but, being a novice in the CPU arena is one thing I am not how ever when it comes to electronics and electrical work on small applications such as a PC.

I double checked my work and then got a second opinion from a buddy that does this stuff full time (my master of training :chk:). He said boards fail, simple as that. Are they tested for structure/connection failure prior to shipping out ever and if so what time frame would be good to go status of working correctly?

PC thanks for the help!!

yea you can get random hardware failure. some boards do turn up DOA. I would of thought they would be throughly tested before being released. Also sometimes depends on the quality of components used. Temperatures can also be a major factor in failing motherboards, High temps can cause damage to essentials controllers on northbridge and southbridge. Somtimes you can have mosfet voltage regulator failure, especially if you up the voltages of your vcore, vd ram fairly high and don't have a mosfet heatsink. Bios chips can fail but they can be replaced. So heat is really the number one motherboard killer, also overclocking past your system bus and memory bus limits, also upping your vcore and vd ram voltage to high. other than that its down to crap components and sometimes motherboard manufacturers especially Asus are super crap for failing motherboards.