Computer problems..

[lingding]

Hey guys, just built my first computer, everything is in correctly however when I turn it on and it is at the windows screen (Windows logo and loading bar underneath) it hangs for almost 5 minutes. This usually happens when the computer has been off for a long time. But lets say when I play on it, then turn it off for a minute and turn it back on, it starts up quick. I took it to my local computer shop and they couldn't find anything. All firmware, etc. is up to date, can you guys help me out? Thanks