This is a Samsung Series 3, Geeksquad refurbished model NP365E5C-S02UB with an a8-4500m apu. Laptop started running slow a month or two ago. I noticed in ResMon that half the RAM was hardware reserved. I took out one of the memory modules, and sure enough the laptop wouldn't boot. I bought new RAM, installed it, and the hardware reserved issue remained. I tested one module at a time in one slot at a time. I confirmed that both modules are working properly, but one slot won't even post. With both slots occupied Bios and windows recognize the RAM module in the corrupted slot, but will allocate it as hardware reserved. I've checked the contacts on the bad slot, but I don't see anything wrong with them. There are no bent pins, debris, or traces burnt onto the board surrounding the slot. Any ideas? I can upload pictures if that helps.