HP ProBook 6550b servicing open changing the thermal paste and changes the processor - YouTube
HP ProBook 6550b 15.6" Widescreen Laptop - with Intel i5-520M 2.4GHz, 4GB RAM, 128GB SSD Hard Drive - Windows 7 Professional 64 - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
HP ProBook 6550b 15.6in. Intel Core i3 1st Gen., 2.27GHz, 3GB Notebook NO HDD | eBay
HP Probook 6450b Fan Cleaning & Thermal Paste Replacement - iFixit Repair Guide