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
Refurbished HP ProBook 6550b Core i7 M620 4GB 320GB DVDRW 15.6 Inch Windows 10 Laptop - Laptops Direct
HP Laptop ProBook Intel Core i5 1st Gen 460M (2.53GHz) 4GB Memory 320GB HDD Intel HD Graphics 15.6" Windows 7 Professional 64-bit 6550b (XT977UT#ABA) - Newegg.com
HP ProBook 6550b WiFi Problem Solved (Tagalog) - YouTube