Were they the same symptoms that caused you to get the repair ISO in the first place, or is this just the boot from CD behaviour ?
If this happens with or without the CD, eject the HDD and reinsert it a few times to clean up the contacts.
If this only happens with the CD in the tray, check it on another PC to make sure the burn worked properly.
You should see "press any key to boot from CD" if you've got a good burn.