Please help! 15 or more minutes to boot up......

My iMac 20" takes more than 15 or 20 minutes to boot up. Anybody have any suggestions to solve this problem? Any idea why the computer is lagging?
Thanks in advance,
Andrew

Hi Roam,
I opened the memory access door and found there are two memory modules, so, I swap them around and retest it. This time I got the error message like follows:
Alert! Apple Hardware Test has detected an error
4MEM/2/40000000:6efa7750
Pass Number:1
Total Time Testing:26secs
Does it mean the Bank/2/ was affected? But when I checked Memory Slot via System Profiler,
I could only see:
Memory Slots Size Type Speed Status
BANK0/DIMM0 2GB DDR2 SDRAM 667MHz OK
BANK1/DIMM1 2GB DDR2 SDRAM 667MHz OK
It seems to be the same before I retest it......(Sorry, I could not remember exactly.)
Do you think all I have to do is to purchase one new 2GB DDR2 SDRAM memory module and replace the one which was affected?
Andrew

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