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How to upgrade RAM memory in HP ProBook 4545s laptop - YouTube
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A-Tech 4GB Module for HP ProBook 4540s Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS322399B12034X1) at Amazon.com
HP ProBook 4540s Optical Drive Replacement - iFixit Repair Guide
HP Probook 4540S Notebook Screen Replacement Procedure - YouTube
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Restored HP ProBook 4540s Notebook- 320GB HDD, 8GB RAM, i5-3230M CPU, Windows 10 Pro - (Refurbished) - Walmart.com
HP 4540s Complete Teardown & Upgrade (SSD, RAM, CPU, Wi-Fi Card, Screen) - YouTube
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Review HP ProBook 4540s Notebook - NotebookCheck.net Reviews
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HP ProBook 4540s - Intel Core i3 3110M / 2.4 GHz - Win 8 64-bit - HD Graphics 4000 - 4 GB RAM - 320 GB HDD - DVD SuperMulti - 15.6" HD anti-glare 1366 x 768 (HD) - brushed aluminum - Walmart.com
