Hi,
I presume the camera is an a570is.
I just installed CHDK using STICK onto an sd card
Assuming you used a picture from the camera in question, STICK installed the correct CHDK build to the card.
Did you lock the card prior to putting it back to camera?
AFAIK you can only start this camera with the playback button when CHDK is set to autoboot, the ON/OFF button will not react.
So I thought alright, I'll just take out the sd card and start it without it, nope.
That means you tried to start the cam without a card? If so, does the blue LED blink without the card?
All I get is a blue light flashing from the print button-but I can't find any mention of what this means.
Do you get this with the card that has CHDK installed (and it's locked)? CHDK starts with flashing one or more LEDs (depending on camera), I think you should see one flash on this camera.