it sound like your 2 problems have 1 solution...
the 2 4pin grounds are proabably not grounds... the internal USB ports use 4pin connectors. so your 2 4pin connectors are probably for the 2 front pannel USB ports. thy might of just used all black wire for some cheap reason reather then the propper collored wires.
the internal usb pins on the Motherboard are located in pairs, in a rectangle box(perhaps green or yellow or black). witch contains a set of 2rows of 10pins, it looks like 1 pin is missing(so 9pins).
use your motherboard manual to differentiate the propwer power and ground pins, then figure out witch of the wires on the case 4pin connector is gournd(perhaps theres a marking on the pin or wire). then connect them to the internal usb port.
EDIT: i just remembered, on all the case connection terminals, such as USB, HDD LED, RESET Button, etc. there is a tiny arrow on 1 pin, indicating +power (i think) i dont remember exactly but i think thats right.