My pentax K10D won't turn on? When I try to turn it on it just displays F-- on the display?? We haven't dropped it or anything it just wouldn't work one day!?

Only Pentax DA and FA J lenses and D FA/FA/F/A lenses having an "A" position on the aperture ring can be used with this camera.

The lens you have is HSM DG

Remove the lens and fire off a few shots. Re-attach the lens and try again. That sometimes works.

Hi,
Repairing the camera is little bit tough for a end user but it can be repaired in any service center as it is a Pentax k10D I will recommend you to keep this camera because this days getting a Japan made camera is as tough as getting water in desert.

No...Pentax recommends turning the SR off.

Pentax K10D shutter release won't function, mirror doesn't open, all else normal.

You need to send it back to a sigma agent

You are probably right - it sounds like it is not connecting right - I would take it and the camera to the store and check out another lens!

Hello,

I don't own a K10D, but I do own a K100D which I have successfully used both manual focus & auto-focus lenses from my old Pentax stash!

1) If it is a manual focus lens, you need to turn off Autofocus on the body of your K10D. On my K100D, there is a switch on the side of the lens mount that says [-MF or -AF]. "-MF" is manual focus mode & "-AF" is autofocus mode. Since your lens doesn't have autofocus capability, turn it to the "-MF" mode.

Also . . . When I press "Menu" and go to "Custom Setting", I change two settings . . .

1) I change "Using aperture ring" to "Permitted". This allows you to use manual lenses (M lenses) that do not have an auto(exposure) setting, and also lets you use Auto lenses (A, KA, KA2, FA, etc.) in either the Auto or manual aperture setting modes.

2) I change "Fl with S lens used" so that even with a manual focus lens, although I don't have autofocus capability, my K100D beeps and shows a little red square in the viewfinder when I have successfully focused manually!

The K10D should have the same options.

This should get you up and running!

I have had a load of fun with my old lens on my new digital Pentax!

Take care & Happy Imaging!
Glen
:)

The lenses are probably manual focus lenses,  

1. Make sure that the apature ring is set to 'A' or automatic, 
   
2. if these are manual focus lenses then switch the focus switch on the left side of the camera body to MF 
3. If this still doesn't work, or you are having trouble with the apature ring then press the menu button to go to the  menu then press the right arrow key untill you are in the  Custom Settings, scroll through the custom settings with the up and down arrow keys until about the 2nd from bottom there is an option called "using aperture ring" set this to 2 (Permitted) This will make the camera take a image when lens is on any f-stop manually. 

Try this and everything should work fine. If all this hasn't worked then try seting the mode dial on the camera to M manual mode. Cheers

Did you put a memory card in the camera?
My camera did this today, and I resolved it by putting a memory card in, but even when one has been out before it still turned on, so I'm not sure that is the resolution. Did you ever find out what was causing it?