Unable to move PSU Mac Pro

i have mac pro has faulty psu needs replacing.

have removed supper drive , t10 screws holding psu in. slide psu towards empty superdrive space , tried remove. there no give on power cables , can not remove the psu enough access cables.

following youtube shows process trying complete
http://www.youtube.com/watch?v=6lozc3ovhdk&feature=related

here video showing issue
http://www.youtube.com/watch?v=zfk8_o3hy1c&feature=youtube_gdata

if can me release psu extremely grateful

 

did @ apple service manual mac pro model ? if tell me model have can send pdf email address.

looking @ them, can see there metal plate @ of optical bay (motherboard side) needs removed have access power cable.

 

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