When i boot to the cd on my emachines i have no problems and the disk has been tested in other pcs and laptops. My son needs to work on our HP, but the monitor shows no signal when I boot to the cd. The lights are flashing on the cd rom drive. Does any body have a fix. Last resort I can switch monitors.
What version of Ubuntu disc are you using?
You may need to change the kernel mode settings and add "nomodeset" or "i915.modeset=1" at the end of the boot parameters. The parameters you need to add will depend on what hardware your HP computer has (namely what type of graphics card it uses).
See this thread for more info.