I plan on starting to sell computers, but I want to ensure that the system is running optimally and unproblematic before I ship it accross the country. Problematic computers may cause even more problems when shipped back due to improper re-packing, which would be incredible costs to take care of. I want to use every ounce of prevention possible. I've heard of some stress-testing programs that make the computer run all processes at nearly 100% for hours to see how the computer does. I also plan on using memtest86 in my tests. Just wondering if anyone has any suggestions on how to go about this and any programs they'd recommend. Thank you!