Some of the newer A4000T models come with oddly shaped card guides that can damage components mounted on expansion boards. Phil Wright provides this diagram:
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
| | |
| | |
| | |
| | |
| |B|
| |A|
| |C|
| |K|
| Zorro Card |P|
| Seen From Above |L|
| (NOT TO SCALE) |A|
| |N|
| Pins of IC come _____ |E|
| dangerously close _|I|_ |_|
| to card guide------> _|C|_ ||
| _____ _____ _|_|_ ||
| ______| |_______| |______ ||
|_| Plastic Card Guide |__||
__|_____________________________|___|