I had some initial difficulty booting from a Knoppix 4.0.2 CD and noticed that a number of other HP Pavillion users had similar problems. Here is what worked for me...
1. Held F9 during boot to set boot order to boot from CD-ROM drive first.
2. Inserted Knoppix CD into CD-ROM reader and continued to boot from CD.
3. Got to Knoppix home screen with 'boot:' prompt at bottom.
4. Hit return to continue with Knoppix boot but screen just went blank with no further CD-ROM or hard drive activity. Checked forums and decided I had problems with display of error message.
5. Shut down and started again by repeating steps 1 to 3 but this time I entered 'knoppix vga=0' after boot prompt and hit return. The Knoppix install continued and this time I saw the following error message:
'Kernel panic - not syncing: IO-APIC + timer doesn't work! [....] try booting with the 'noapic' option'
6. Shut down and repeated steps 1 to 3 again but this time I entered 'knoppix noapic' after boot prompt and hit return.
At this point Knoppix installed properly and all was well. Hope this helps others out there with similar problems.
Intel Core i7-13700KF - 13th Gen Raptor Lake 16-Core (8P+8E) Desktop CPU Proc...
$269.99
Intel - Core i7-12700K Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unloc...
$214.99
Intel - Core i9-12900K Desktop Processor 16 (8P+8E) Cores up to 5.2 GHz Unloc...
$309.99
Intel Core i7-13700K - Core i7 13th Gen Raptor Lake 16-Core (8P+8E) P-core Base
$219.90
Intel - Core i9-14900K 14th Gen 24-Core 32-Thread - 4.4GHz (6.0GHz Turbo) Soc...
$619.99
AMD Ryzen 5 7600x Processor (5.3 GHz, 6 Cores, LGA 1718/Socket AM5) NEW OEM Tray
$169.98
INTEL CORE I5-9600K 3.7GHZ SOCKET LGA1151 6-CORE DESKTOP CPU PROCESSOR SRELU
$55.00
AMD Ryzen 5 3600 3.6GHz 6-Core 12T PROCESSOR Socket AM4 CPU 65W B450
$59.00
** Intel i3 10100F CPU Processor - USED **
$47.99
Intel Xeon E5-2699 v3 2.3GHz 18-Core 45MB 145W LGA2011-3 CPU/Processor SR1XD
$40.99