HP Laptop Intel Core i5 1st Gen 430M (2.26GHz) 2GB Memory 320GB HDD Intel GMA HD 15.6" Windows 7 Professional / XP Professional downgrade ProBook 6540b (FN086UT#ABA) - Newegg.com
User manual HP ProBook 6440b (English - 221 pages)
HP ProBook 6540b Notebook PC | HP® Customer Support
HP ProBook 6540b Bios Password Reset - Notebook PC