Travel straight back to 2004 and the absolute golden era of mid-2000s multimedia computing with an authentic, wonderfully preserved flagship battlestation: an original HP Pavilion a820n Mid-Tower PC running its factory-original Windows XP installation!

Having the original factory operating system installation makes this system exceptionally desirable for collectors, archivists, and retro enthusiasts: all proprietary Hewlett-Packard Intel 915G chipset drivers, Intel GMA 900 graphics acceleration, Realtek 8-channel high-definition audio codecs, IEEE 1394 FireWire controllers, and 9-in-1 media reader profiles are completely native and fully configured out of the box—with zero missing driver yellow exclamation marks!

Finished in HP’s iconic two-tone silver and deep charcoal mid-tower chassis featuring a smooth sliding door concealing a front drive bay and convenience ports, a blue backlit center power button, and intact factory spec labels, the a800 series represented the height of home desktop multimedia capability. Powered by a high-frequency Intel Pentium 4 540J processor clocked at 3.20GHz (LGA775 Prescott architecture, 1MB L2 cache, 800MHz FSB, Hyper-Threading Technology), 2.25 GB of DDR SDRAM (2.24 GB recognized with Physical Address Extension active), and an internal 200GB 7200RPM SATA hard drive (180 GB formatted NTFS C: partition with over 104 GB of free space), this tower boots cleanly and swiftly into an authentic installation of Microsoft Windows XP Home Edition (Version 2002, Service Pack 3) complete with classic OEM utilities and desktop wallpaper!

For retro PC gamers, vintage hardware collectors, and software archivists, an authentic bare-metal Windows XP machine is the ultimate platform for turn-of-the-millennium through mid-2000s classics that run into severe DRM blocks (SafeDisc/SecuROM), 16-bit installer bugs, scaling issues, or audio driver incompatibilities on Windows 10/11. Backed by integrated Intel Graphics Media Accelerator 900 (up to 128MB shared video memory) and a high-efficiency Thermaltake power supply upgrade, it effortlessly powers through era classics like The Sims & The Sims 2, Diablo II: Lord of Destruction, RollerCoaster Tycoon 1 & 2, Half-Life 2, Warcraft III: The Frozen Throne, StarCraft: Brood War, Age of Empires II, Civilization III & IV, Far Cry, Doom 3, Quake III Arena, Unreal Tournament 2004, and classic PopCap games.

Built with exceptional expansion potential and authentic legacy connectivity:

• Upper 5.25" optical drive: LightScribe 16X Double Layer DVD±RW / CD-RW multi-burner combo drive with direct laser disc labeling technology

• Lower 5.25" optical drive: Dedicated CD-ROM optical reader drive (ideal for direct disc-to-disc copying and audio CD playback)

• Integrated 3.5" 1.44MB floppy diskette drive concealed behind the front sliding bay door (essential for vintage floppy gaming, boot disks, and retro diskette archiving)

• Integrated 9-in-1 digital media card reader (SmartMedia/xD, CompactFlash I/II, MMC/SD, MS/MS PRO)

• Front convenience console: 3 high-speed USB 2.0 ports, a 6-pin IEEE 1394 FireWire port, and 3.5mm microphone/headphone/line-in jacks

• Internal PCI Wi-Fi Wireless Card with rear gold SMA antenna terminal

• Internal PCI 56K data/fax modem card

• Full motherboard rear legacy I/O: dual PS/2 ports for vintage mechanical keyboards and ball mice, 4 rear USB 2.0 ports, 6-pin IEEE 1394 FireWire port, 10/100 Ethernet networking, a DB-25 parallel printer port, and native analog VGA video output (ideal for connecting directly to external CRT gaming monitors or vintage 4:3 LCDs)

• Full 8-channel surround analog audio jacks (with side, rear, c/sub, line-out, mic, and in) plus digital audio RCA input and output ports

• Upgraded Thermaltake power supply with gold wire fan grille and independent power switch for maximum power delivery and rail stability

Key Specifications & Retro Hardware Details

• Brand: Hewlett-Packard Company (HP)

• Model: Pavilion a820n / Pavilion a000 Series (Product Number: PP165AA / Serial Number: MXM4510BV7)

• Form Factor: Full Expandable Mid-Tower ATX PC Chassis with Sliding Front Compartment Door

• Processor (CPU): Intel Pentium 4 540J Processor @ 3.20 GHz (LGA775, Prescott Architecture, 1MB L2 Cache, 800 MHz Front Side Bus, Hyper-Threading Technology)

• Installed Memory (RAM): 2.25 GB DDR SDRAM (PC3200 / 2.24 GB recognized with Physical Address Extension active)

• Storage (HDD): 200 GB 7200 RPM Serial ATA (SATA) Hard Drive (180 GB formatted NTFS C: capacity with ~104 GB free space)

• Operating System: Microsoft Windows XP Home Edition (Version 2002, Service Pack 3, Original Factory Installation with all period drivers present and fully configured)

• Graphics: Integrated Intel Graphics Media Accelerator 900 (GMA 900, up to 128MB shared video memory) with 15-Pin Analog VGA Output

• Optical Drives Installed:

  • Upper Drive: 5.25" LightScribe 16X Double Layer DVD±RW / CD-Writer Combo Drive

  • Lower Drive: 5.25" Dedicated CD-ROM Reader Drive

• Floppy Drive: Integrated 3.5" 1.44MB Floppy Diskette Drive (located inside front sliding bay)

• Front Access Console & Media (Concealed behind Sliding Door):

  • 9-in-1 Digital Media Card Reader (SM/xD, CF I/II, MMC/SD, MS/MS PRO)

  • 3 x Front-Facing High-Speed USB 2.0 Ports

  • 1 x Front-Facing 6-Pin IEEE 1394 FireWire Port

  • Front 3.5mm Headphone Out, Microphone In, and Line-In Audio Jacks

  • Center Square Power Button with Blue Illuminated Halo and HDD Activity LED

• Rear I/O Connectivity:

  • 1 x 15-Pin Analog VGA Video Monitor Output (ideal for CRT gaming)

  • 4 x High-Speed USB 2.0 Ports

  • 1 x 6-Pin IEEE 1394 FireWire Port

  • 1 x RJ-45 Ethernet 10/100 Network LAN Jack

  • 2 x PS/2 Legacy Ports (Color-coded for Keyboard & Mouse)

  • 1 x DB-25 Parallel Printer Port (LPT1)

  • Digital Audio In & Out RCA Jacks

  • Full 6-Port Surround Analog Audio Jacks (Side, Rear, C/Sub, Mic, Line-Out, Line-In)

  • Dedicated PCI Wi-Fi Wireless Card with Gold SMA Antenna Connector and Link LED

  • Dedicated PCI 56K Data/Fax Modem Card (RJ-11 Port)

  • Upgraded Thermaltake Internal Power Supply with 3-Prong AC Inlet, 115V/230V Switch, and On/Off Rocker

• Case Badges: Original factory Intel Inside Pentium 4, Designed for Windows XP, HP a820n model plate, and front factory specification stickers intact

Condition Notes

• Functional Condition: 100% bench-tested and fully operational. Boots cleanly and swiftly into its original factory installation of Windows XP Home Edition SP3 with all native HP drivers and system utilities verified. The Intel Pentium 4 3.20GHz processor runs responsive and cool, memory tests healthy, and the 200GB SATA hard drive reads and writes cleanly with a healthy partition structure. The 3.5" floppy drive reads disks properly, both optical drives actuate and read media smoothly, the front sliding door glides evenly, cooling fans spin freely, and the onboard VGA port outputs a crisp, rock-solid display signal.

• Cosmetic Condition: Great vintage condition overall. The two-tone silver and dark gray mid-tower chassis, front sliding door, and steel side panels are structurally solid with no broken covers, missing feet, or cracked plastic. Shows light, normal cosmetic surface marks, faint shelf wear, and minor hairline scuffs consistent with careful home use and vintage age (factory retail specification stickers remain preserved on the lower front faceplate). Original front badges, embossed HP emblem, and rear manufacturing barcode label (PP165AA / MXM4510BV7) remain intact and legible. Please review the high-resolution photos for an exact look at physical condition.

What's Included

• HP Pavilion a820n Mid-Tower Desktop PC (Complete with Pentium 4 3.20GHz CPU, 2.25GB RAM, 200GB HDD, dual optical drives, 3.5" floppy drive, card reader, PCI Wi-Fi card, and Thermaltake power supply)

• Standard Heavy-Duty AC Power Cable

• Note: The external NEC monitor and video cables shown in testing photos are for demonstration purposes only and are NOT included.

Professional Packaging & Shipping Notice

Mid-tower desktop PCs house mechanical hard drives, dual optical drives, floppy mechanisms, and heavy internal power supplies that require robust transit protection. This machine will be wrapped securely in anti-static ESD shielding, cushioned generously with thick layers of heavy-duty bubble padding, and boxed inside a rigid, double-walled container to guarantee safe delivery directly to your retro workbench.