Imac(intel) 27" won't start, can I save data?

I have OS X.?.? the bought the Imac 27" in June 2010
after holding the on/off button for 3 seconds, the computer shuts down finally.
then I hit the on button. I get the initial sound, then I get grey screen with spinning wheel. I let that go for hours and nothing happens. I have to do 3 second off button hold again.
I found there recovery mode and safe mode and others. I do NOT have a backup, but want to save my data some how. I have a USB external HD. I do not have a second Mac.
what do I do first? recovery mode, then start disk utility and then repair startup disk? Or do I work to save my data to external HD first?

Thanks Carolyn. Do i hold the command + R key before or after startup tone?
I held down the command + R key before hitting the power button and just got the same white screen with apple and spinning wheel.
I now held down the shift key for safe mode AFTER the startup tone and held until got spinning wheel and it is still spinning???
for recovery and startup mode, how long can it take until the spinning wheel goes away?
also if recovery and startup modes do not work, then what next?
1. command + S or
2. start from disk. I have the OS X install DVD
thanks so much for your assistance

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Removable Media:          No
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TRIM Support:          Yes
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S.M.A.R.T. status:          Verified
Volumes:
Capacity:          209.7 MB (209,715,200 bytes)
Writable:          Yes
BSD Name:          disk0s1
Macintosh HD:
Capacity:          250.66 GB (250,656,219,136 bytes)
Available:          181.08 GB (181,075,189,760 bytes)
Writable:          Yes
File System:          Journaled HFS+
BSD Name:          disk0s2
Mount Point:          /
APPLE SSD TS256B:
Capacity:          251 GB (251,000,193,024 bytes)
Model:          APPLE SSD TS256B
Revision:          AGAA0206
Serial Number:                  Y06****T4SZ
Native Command Queuing:          No
Removable Media:          No
Detachable Drive:          No
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TRIM Support:          Yes
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Partition Map Type:          GPT (GUID Partition Table)
S.M.A.R.T. status:          Verified
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Capacity:          209.7 MB (209,715,200 bytes)
Writable:          Yes
BSD Name:          disk0s1
Macintosh HD:
Capacity:          250.66 GB (250,656,219,136 bytes)
Available:          181.08 GB (181,075,189,760 bytes)
Writable:          Yes
File System:          Journaled HFS+
BSD Name:          disk0s2
Mount Point:          /
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I also sold my 3 or 4 year old HP computer last year, and it put in a strong service life. The new owners are still using it without any trouble (I know them). And, it never failed once. Again, I only paid about $400 for it as well.
I've owned tons of PC's and the following Mac's:
PowerMac G3 266-DT
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iMac G3 333 (Lime)
iMac G5 (rev. A) 1.8 GHz
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iMac G5 (rev. B) 2.0 GHz
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Imac(intel) 27" won't start, can I save data?

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