new hd cpu

Hi

I am having problems with my year old Seagate hd 1tb I have run hp test they suggest backup and replace I have bought a new 2tb hd and an Intel Core2 Duo E8400 2x 3.00GHz S775 I have read all I can find about compatibility but would much appreciate any advice.
brief specs

Manufacturer HP-Pavilion
Family 103C_53316J
Product Name VG239AA-ABU p6203uk
Model VG239AA-ABU p6203uk
Version
Serial Number 3CR93516VY
SMBIOS Asset Tag Asset-1234567890
SKU Number VG239AA#ABU
Chassis Not Available
PC System Type Desktop
Machine Type AT/AT COMPATIBLE
Infrared (IR) Supported No
UUID 4886CE7A-4793DE11-AB8AFCC8-DBF96

Motherboard
CPU Type DualCore Intel Pentium E5300, 2600 MHz (13 x 200)
Motherboard Name Pegatron IPMEL-AE (Evans) (1 PCI, 2 PCI-E x1, 1 PCI-E x16, 2 DDR3 DIMM, Audio, Video, LAN)
Motherboard Chipset Intel Eaglelake G41
System Memory 4064 MB (DDR3-1333 DDR3 SDRAM)
DIMM1: SK Hynix HMT125U6BFR8C-H9 2 GB DDR3-1333 DDR3 SDRAM (9-9-9-24 @ 666 MHz) (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
DIMM3: SK Hynix HMT125U6BFR8C-H9 2 GB DDR3-1333 DDR3 SDRAM (9-9-9-24 @ 666 MHz) (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
BIOS Type AMI (01/26/10)

DMI
DMI BIOS Vendor American Megatrends Inc.
DMI BIOS Version 5.07
DMI System Manufacturer HP-Pavilion
DMI System Product VG239AA-ABU p6203uk
DMI System Version
DMI System Serial Number 3CR93516VY
DMI System UUID 4886CE7A-4793DE11-AB8AFCC8-DBF9678D
DMI Motherboard Manufacturer PEGATRON CORPORATION
DMI Motherboard Product EVANS
DMI Motherboard Version 1.02
DMI Motherboard Serial Number 101271560001997
DMI Chassis Manufacturer Hewlett-Packard
DMI Chassis Version Chassis Version
DMI Chassis Serial Number DM0001
DMI Chassis Asset Tag Asset-1234567890
DMI Chassis Type Desktop Case

Yours sincerely

chrisjohn