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HP ProBook 640 G1 Business Laptop, Intel Core i5-4th Generation CPU, 8GB DDR3 RAM, 256GB SSD Hard, 14 inch Display, Windows 10 Pro (Refurbished)
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Removing and Replacing the Memory Module | HP Probook 640 and 645 G2 Notebooks | HP Support - YouTube
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HP ProBook 640 G1 650 G1 Intel Laptop Motherboard, P/N: 744007-001 6050A2566302-MB-A03 - WIT Computers
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