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Dell Optiplex GX520 Desktop PC - Intel Pentium 4 3.0GHz, 2GB DDR2, 400GB HDD, DVDRW, Windows XP Professional, (Off-Lease) at TigerDirect.com
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Best Buy: Dell Optiplex Desktop Computer 2 GB Memory 40 GB Hard Drive GX520
How to change a Hard Disk Drive in a Dell Optiplex GX520 Small Form Factor - YouTube