I bought an HP Pavilion 510c 5 months ago and it has been nothing but trouble. After a couple of months I received the message "operating system not found" rendering the computer unusable. It was returned to HP who installed a new hard drive. Upon its return to me I began having a problem on startup and upon rebooting where the screen it would just be blank. HP stated it was probably a motherboard problem and decided to send me a whole new 510C. Guess what? It had the same blank screen problem. I have been instructed by... read full review »