Problem with CF Reader

Hello
I bought a MPC from USA a couple of weeks ago and arrived yesterday.
I bought also a CF card yesterday for it and it arrived this morning. I have put it on the memory card slot and the MPC just don't load. The screen turns all green and nothing happens...It also happens when I insert it while the MPC is loaded...
I am really depressed right now...Like a month to arrive, bought for 480€ and now nothing works...
Any help?
Thanks

I wouldn't insert it while the machine is turned on

you might have bent a pin in the card slot

some of these threads give tips on fixing it
search.php?keywords=straighten+%2B+pin+%2B+slot&terms=all&author=&sc=1&sf=all&sk=t&sd=d&sr=posts&st=0&ch=300&t=0&submit=Search