Review HP ProBook 6550b Notebook - NotebookCheck.net Reviews
HP Laptop ProBook Intel Core i5 1st Gen 450M (2.40GHz) 4GB Memory 320GB HDD Intel HD Graphics 15.6" Windows 7 Professional 32-bit 6550b(WZ242UT) - Newegg.com
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How to remove and install new memory (RAM) in a HP ProBook 6550B - YouTube
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HP ProBook 6550b / 4GB RAM, 500GB HDD IntelCore i5, 2.5GHz, 15.5" / windows 10 / GRADE: A | Baudspace Warehouse