After erasing hard drive and re-installing Lion, is there anyway i can tell if all my files are gone?

Hey guys.
Basically i have sold my iMac after buying a new Macbook Pro. I erased hard drive in disc utility then reinstalled Lion from disc.
When i turn on the iMac now it does the usual welcome video, then proceeds to try and set up the machine. Which i dont want to do as i have sold it and he will want to do that himself.
Dont personally know the guy ive sold it too so basically i want to know how i can check to see if my files have actually been deleted?
Just so all my personal information isnt accessed by someone else.
Thanks a lot

If you erased the disk, the data is gone. If you want to be sure, you can open Disk Utiility again and erase the disk using a special method (select the hard disk > Erase > Security Options) before installing Mac OS X

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Command R (no option)
From what I learned from testing with a number of people, you do need to invoke IR in certain circumstances.
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IR would appear to be helpful here since the OP is unable to use his Apple ID?

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First Off:
Macbook 13" (late 2009) ... It was running Mountain Lion 10.8.5 with 2 gigs of memory and 160gig stock hard drive.
I started this process almost a week ago and despite numerous attempts every night I have had no luck. I appologize if the details here are fuzzy, my head is spinning after reading dozens of threads and attempting multiple solutions to each error I've received and i cant remember everything I've tried so far...
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Next came my new Seagate Momentus 750 gb 7200 rpm SATA 3gb/s 16Mb Internal Hard Drive.
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Disk Utility isnt getting me anywhere, im either getting errors like:
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Ive zapped the PRAM.... and Ive done other things that I cant quite remember right now because my brain is boiling from reading too many **** threads on multiple devices....
halp.
halp me plase.

So funny story...
While writing this discussion I had to come to the computer and try to erase the drive so I could see the error code for reference. The erase didnt work as usual but I wrote the error code down here.
I also could not remember the error code for partitioning the drive so I attempted that as well so I could write down the code, and this time it magically partitioned successfully! The only thing I did differently was that I didn't rename the partition because i figured it wouldn't matter anyway. Since the partition was successful, I attempted the Reinstall of ML and it magically worked!!
I dont know what the **** happened but ive been attempting this install every night for like 3 hours since Monday and this is the first time it went through... for no apparent reason?
Ghosts? Magic? Full Moon?
we may never know...
Thanks anyways guys!

Not solved with Blinking Folder with Question Mark after Erasing Hard Drive

Before asking, I found someone had asked exact the same question, but that was actually an unsolved thread.
Re: Blinking Folder with Question Mark after Erasing Hard Drive to try to restore to Factory Settings
Level 1(0 points)sdc3gJul 5, 2013 6:24 PM Re: Blinking Folder with Question Mark after Erasing Hard Drive to try to restore to Factory Settings
Re: Blinking Folder with Question Mark after Erasing Hard Drive to try to restore to Factory Settings
in response to Niel
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After erasing hard drive and re-installing Lion, is there anyway i can tell if all my files are gone?

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