Canon MARK III EOS-1 DS Instruction Manual page 192

Troubleshooting Guide
Live View shooting is not possible.
When using Live View shooting, use a memory card (a hard disk-type
card such as MicroDrive is not recommended). A hard disk-type card
requires a lower temperature range for operation than with normal
memory cards. If the temperature gets too high, the Live View shooting
may stop temporarily to prevent damage to the card's hard disk. When
the camera's internal temperature decreases, the Live View shooting
will be able to resume. (p.109)
Image Review & Operation
The image cannot be erased.
If the image has been erase-protected, it cannot be erased. (p.123)
The shooting date and time displayed is incorrect.
The correct date and time has not been set. (p.46)
No image appears on the TV screen.
Make sure the video cable plug is connected all the way in. (p.122)
Set the video OUT format (NTSC/PAL) to the same video format as
the TV. (p.44)
Use the video cable that came with the camera. (p.122)
192