Has soldering come loose?

My Compaq(SerialNo. 8136FR4Z08RH) stopped booting telling me to change
keyboard.

Friend from India said, bring the motherboard here we will put a bit
of solder on key-mouse-motherboard.

Decided to scrap it.

Put it sideways to scavange it for hdd, cards.

Last ditch effort with keyboard-mouse in pressed key-mouse-connector-
tiny-box onto motherboard a little & powered it last time

AND IT BOOTED.

Connected key-mouse work perfectly on other PCs but on this they
stayed dead.

Luckily usb-wireless Key-Sonic keyboard had arrived in the morning and
it worked.

Machine had to be shut to place it back in the rack.

But am afraid to pull out keyboard-mouse(though they are not working)
and to put machine back with those things hanging from there have to
get some ablebodied help.

Though http://h41111.www4.hp.com/compaq/uk/en/ might help but may be
my machine is too old.