I'm trying to fix my housemate's laptop, it's a HP Pavillion dv4000.
I turn it on, the screen with <f2> enter setup <f10> change boot order
It then goes to the windows xp loading screen with the blue scrolling bar for an abnormally long time... maybe 2 minutes. Then the blue bar freezes, a blue screen flashes past too quick to read and it goes back to the "HP invent" startup screen with the change boot order, enter setup and boot from LAN options like at the beginning. After leaving it running for a bit it comes up with a black screen with the following written on it:
For Realtek RTL8139(x)/8130/810X PCI Fast Ethernet Controller v2.13 (020326)
PXE-E61: Media test failure, check cable
PXE-M0F: Exiting PXE ROM.