Refurbished: HP 8540P 15.5" Windows 7 Professional 64bit Laptop (Microsoft Authorized Refurbish) w/1 Year Warranty - Newegg.com
8Gb 2x 4Gb RAM for HP Compaq Elitebook 8540p Dual Core DDR3 8500 | eBay
595764 001 KAQ00 LA 4951P QM57 8GB RAM Ver MotherBoard SYSTEM BOARD for HP ELITEBOOK 8540P 8540W Support FX880M M5800 FX1800M|Motherboards| - AliExpress