Thanks for the help! I found the shop on Zhengyi Lu. I will try it out and let you know about the result.
Yankee00: Maybe ask Daffyd Thomas to repair your computer?

@beizhen, haha! It's fine, I just turned it off and on again :P

"If your source image is digital, it's likely not that high resolution to warrant physically large printing at a high DPI."

That is only a problem if he is shooting in JPG. If he is shooting in RAW (or if it is a TIFF file) then he will have all the data he needs to print a large high quality picture.