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HP Pavilion PCs - Resetting the BIOS When the Monitor is Blank
Use this solution when there is no image on the monitor (blank screen) after installing a new graphics card, disabling the on-board video or disabling the default graphics adapter.
If the HP logo screen does not appear, then perform the following steps:
The starting screens should now be visible. Retry several times as necessary. If the monitor stays black, then disconnect the monitor cable to see if any of the monitor's built-in messages appear. If no messages appear, adjust the contrast and brightness up until something is seen. If the picture stays blank, then the monitor may be bad and need replaced.