HP Compaq dc7800 USDT Troubleshooting Manual page 28

Table 2-5 Solving Media Card Reader Problems (continued)
After inserting a media card in the reader, the computer attempts to boot from the media card.
Cause
The inserted media card has boot capability.
22 Chapter 2 Troubleshooting Without Diagnostics
Solution
If you do not want to boot from the media card, remove it during
boot or do not select the option to boot from the inserted media
card during the boot process.
ENWW