HP dx7500 - Microtower PC Service & Reference Manual page 171

Table C-6 Solving Display Problems (continued)
Blank screen (no video).
Cause
Monitor settings in the computer are not compatible with the
monitor.
Monitor is configured to use an input that is not active.
Cannot enable integrated graphics after installing a PCI Express graphics card.
Cause
On systems with Intel integrated graphics, the integrated
graphics cannot be enabled after installing a PCI Express x16.
Blank screen and the computer emits one short beep then one long beep followed by a three second pause.
Cause
Pre-video memory error.
Blank screen and the computer emits two short beeps then one long beep followed by a three second pause.
Cause
Pre-video graphics error.
Solution
1. In Windows XP Control Panel, double-click the Display
icon and select the Settings tab.
In Windows Vista Control Panel, under Appearance and
Personalization, select Adjust screen resolution.
2. Use the sliding control to reset the resolution.
Use the monitor's on-screen menu controls to select the input
that is being driven by the system. Refer to the monitor's user
documentation for more information on the on-screen controls
and settings.
Solution
The integrated graphics can be enabled in Computer Setup if
a PCI Express x1 graphics card is installed, but it cannot be
enabled if there is a graphics card in the PCI Express x16 slot.
Solution
1. Reseat DIMMs. Power on the system.
2. Replace DIMMs one at a time to isolate the faulty module.
3. Replace third-party memory with HP memory.
4. Replace the system board.
Solution
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.
Solving Display Problems 161