when you instal a system ,this HP nc4010 nc4000 laptop need reboot from DVD-Rom.
how to set System BIOS boot devices?
at this point,I want to complain Hp company.Is in the details, HP did a very poor.for example(e.g.) the methodof set USB-dvdRom boot is very complex.I believe 99 percent user cann’t set this.More unreasonable is HP laptop  have not a driving-disc,user must download from website by yourself.or network card is not even how to download network
driver installation was also very strict order,the cost of drive CD is very cheap.faint.
And now, men, let us get to business.

this way refers only to HP Compaq nc4010 nc4000 laptop,
problem description:
when you reinstall new operating system for your Hp nc4010 or NC4000 Laptop,you must need set reboot from DVDrom.
if you know a the right approach,you just stand by anxiously.

Solution:
please confirm that USB-DVDrom have connected your laptop before you boot  your laptop,
reboot your laptop and press F10 key enter laptop motherboard BIOS seting.
please switch to Advanced menu and choose Device Options.
1.find “USB legacy support” menu and set it to Enable.
2.press F10 key and saved.
3.switch “ Security”  menu and choose “Device Security”
4.choose “CD-ROM boot and/or Floppy boot” menu and set it to “Enable”.
5.press F10 key and saved.
6.switch “File“menu and choose”Save Changes and Exit“,press F10 key for save.laptop will reboot.
than enter BIOS again,chenge System BIOS boot devices.
1.enter “setup”
2.switch Advanced menu，choose “Boot Options”
3.set”MutiBoot Option” to “enable”
4.if the USB-DVDrom have connected your laptop,this  USB-DVDrom will be show in “Boot Order”
5.modify this order,set USB boot to top.press F10 key and saved.
6.switch “File“menu and choose”Save Changes and Exit“,press F10 key for save.laptop will reboot.
ok,your HP Compaq nc4010 nc4000 laptop will boot from USB-DVDrom.