Try hitting Ctrl+Alt+- (That's the minus key) or Ctrl+Alt+F2.
Got it installed to hd and can dual boot (using the knoppix boot manager) knoppix or xp. since i've run knoppix from cd, i knowthe pc can handle it. but now with it installed to the hd, after it boots knoppix and all the stuff loads, i get a monitor out of frequency range type message. the screen goes black and stays black, but I can see the hd being accessed. of course with nothing on the screen, kind of hard to guess what it's doing. what i think i need is for it to boot 800x600, so how do i get it to do that? i say that because on some other live cds if i didn't select that, i got the blank screen. help!!
Try hitting Ctrl+Alt+- (That's the minus key) or Ctrl+Alt+F2.
you could copy the /etc/X11/XF86Config from knoppix to your /etc/X11... and remove everything larger than 800x600... that might work well.

128GB (4x32GB) SK hynix DDR4 PC4-2666V RDIMM ECC Server Ram HMA84GR7CJR4N-VK
$799.00
Microsoft Office 2021 Pro Plus USB for 1PC Windows 10 & 11
$62.50
lOT OF 4 SKhynix 8GB (4 x 8GB =32GB) HMA41GR7MFR8N-TF 2R8 PC4-2133P DDR4 MEMORY
$89.00
TF/SD Card Adapter Camera Reader Android Type-c For iPhone17 Pro Max Plusm lot
$573.98
Kingston 32GB 64GB 128GB 256GB USB 3.0 Flash Drive Thumb Memory Stick Pen lot
$285.90
USB 3.0 Flash Drive 32GB 64GB 128GB Memory Stick Thumb Stick Lot Pack
$826.09
LOT OF 4 HP 840758-091 32GB DDR4 PC4-2666 Registered Server Memory 128GB Total
$1000.00
USB 3.0 Micro SD SDHC TF Card Reader Memory Adapter for PC Laptop Camera lot
$3.75
Dell Precision 3541 Laptop i5-9300H 2.4GHz 256GB SSD 16GB RAM Win 11 Pro
$189.99
Used Computer RAM - This Is For Multiple Sticks Of RAM
$120.00