I'd use "with", but "for" is almost as good.
However, "the steps to start the system" is a little messy. I'd recommend changing that part to "system initialization" or "system startup". If you do that, you would probably use "during" instead of "for" or "with".
"Special attention is required during system initialization."
"Special attention is required during system startup."
"Special attention is required during the system startup process."
"Special attention is required when starting the system."
Or:
"System (initialization/startup) requires special attention."
"The system startup process requires special attention.""
"Starting the system requires special attention.""
I hope this helps.