HP dx7500 - Microtower PC Troubleshooting Guide

The computer emits one short beep then one long beep followed by a three second pause.
Cause
Solution
Memory is installed incorrectly or is bad. CAUTION: To avoid damage to the DIMMs or the system
board, you must unplug the computer power cord before
attempting to reseat, install, or remove a DIMM.
1. Reseat DIMMs. Power on the system.
2. Replace DIMMs one at a time to isolate the faulty module.
NOTE: DIMM 1 must always be installed.
3. Replace third-party memory with HP memory.
4. Replace the system board.
The computer emits two short beeps then one long beep followed by a three second pause.
Cause
Solution
Graphics card is not seated properly or is bad, or system board
is bad.
For systems with a graphics card:
1. Reseat the graphics card. Power on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the system
board.
Table 2-11 Solving Hardware Installation Problems (continued)
30 Chapter 2 Troubleshooting Without Diagnostics ENWW

HP dx7500 - Microtower PC Specifications

General

Memory	Up to 8 GB DDR2 SDRAM
Form Factor	Microtower
Power Supply	300W
Processor	Intel Core 2 Duo, Intel Pentium Dual-Core, Intel Celeron
Storage	SATA hard drives up to 500 GB
Optical Drive	DVD-ROM or DVD+/-RW
Graphics	Integrated Intel Graphics Media Accelerator 3100, Optional discrete graphics cards
Audio	Integrated High Definition Audio
Network	Integrated Gigabit Ethernet
Expansion Slots	1 PCI Express x16, 2 PCI Express x1, 1 PCI
Ports	USB 2.0, serial, parallel, VGA, audio in/out
Operating System	Windows Vista Business, Windows XP Professional, FreeDOS
Weight	Approx. 22 lbs (10 kg)