Hi, please check out page 70,   [URL]   And make sure you’re very very careful when you pull out the blade handle pressing the button.
I have a Dell M630 which is out of the Chassis but the release handle is closed. This prevents me from installing the blade and in fact the blade gets "stuck" in the Chassis, when attempted to insert. Is there a way to force "eject" or release of the handle?    Thanks,  Ryan   
Dell Blade Force Release