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My new PC came today. I set it u the PC will power on but won't start.
the monitor doesn't recognize the sorce.
> PC will power-on, but won't start.
You have a warranty with your new PC.
Did you get any "paper", e.g., a warranty-statement, with a telephone-number to call for assistance?
> something is missing or not hooked up, maybe like a disk drive.
That's the most-likely explanation -- something was not "tightly" connected at the factory, and "jiggled loose" while the computer was being shipped & bounced around.
Other possibility: the power-supply outputs various voltages (5V, 12V).
If it has a problem, then the voltage-level to power the lamps is working,
but the voltage-level to power the motherboard or the disk-drive is not working.
Reboot, and enter BIOS SETUP.
Look for details about whether both the CD/DVD drive and the disk-drive are "detected", and listed.
But, you should not have to do your own "trouble-shooting" on a brand-new computer by yourself.
Call HP, and make them "earn" the money that you paid them for your new HP computer.
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