imac boots with black squares on white screen

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dear all
intel imac 8.1 has been having problems, here's rundown

screen freeze reboot after cooling down.
machine freeze often
sometime machine boot again normally
machine boot in safe mode.
machine not boot further white apple logo.
top lefthand corner of machine becoming increasingly hot.
machine not boot @ in safe mode.
machine has white screen small black squares on boot , go no further.

have tried following remedies
set new user account
repaired permissions on several occasions
run hardware test disc showed error error on imac 4mot/1/40000003: hdd - 1340 suggests hdd prob.
reinstalled os x leopard original disc upgraded snow leopard , installed lion.
tried new hard drive

have looked @ various threads , suggest hard drive problem graphics card. trying establish close possible might problem. appreciated.

many thanks
jimbob61
 

your graphics failing... recommend low medium end ati replacement card (depending on planning on imac).
 


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