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Your post may refer to three (3) settings: 1) BIOS for the laptop/hardware itself or the 2) operating system or 3) password.
BIOS - Upon restart, when the logo screen is displayed, press F2 to enter BIOS Setup.
OS - to really get back to the beginning:
1. Go to System restore and click on the first/earliest date of restore point. This would perhaps be the earliest backup of your system and everything will revert to as to how it was then; or
2. Reformat, clean/fresh install of Windows.
Now if you are referring to forgotten BIOS or entry password, you have to bring it to HP service with proof of ownership/purchase and other documentations.
Good luck and kind regards.
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Removing the CMOS battery like the one shown in the picture to the right will cause the system to loose all CMOS settings including the password. To do this locate and remove the CMOS battery on themotherboard for at least five-minutes. After this has been done put the battery back into the computer and turn it back on. Jump the CMOS solder beads Older computers and especially older laptops don't have jumpers or dipswitches and require the user to jump a pair of solder beads on a circuit board. The identification and location of these solder beads can vary and if not available in computer documentation is only obtainable through the computer manufacturer. If you've identified the solder beads they can be jumped by placing a flat-head screwdriver over the two beads and leaving it on those beads while turning on the computer. Once the computer has booted turn off the computer and then remove the screwdriver.
The best way I have found to remedy this type of issue is to reset the printer to factory settings. Push the check mark button (green) and scroll down to the resets and restore to factory settings. This will reset everything and you can start over. Also on the computer you are printing from there are default settings under the printing preferences that should be set to default printer settings. You can try one or the other but I usually do both because it saves time in the long run.
Optoma USA recommend that you set the PC resolution to SVGA (800 x 600) or XGA (1024 x 768).
Your HP Pavilion ze 4900 default resolution is S = SXGA (1400 × 1050) or X = XGA (1024 × 768).
I would assume that your cable(s) are properly mated/attached from the laptop to the projector. If on pressing TV Now! One-Touch button with a TV icon at the top of your keyboard to switch the display to the TV-Out mode, there is no picture projected, you can try to manually lower the screen resolution of your PC. Try lowering it to the 800 X 600 setting in your Display Properties. Also, you may want to check if the Dual Display Mode is enabled/activated. You can try different resolution setting as long as the projector can handle it. Hopes this works and give you an idea. Should you need more assistance, pls post/comment. Good luck and kind regards.