Can a bad Optical Drive affect my Intel Imac boot sequence?

Joined
Mar 25, 2009
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Location
Parksville, BC
Your Mac's Specs
Macbook pro 2009, Macbook 2007, iPhone 3G, Power PC G5
I've got a sweet Intel Imac that was suffering from bad / inconsistent boots and poor performance. I reinstalled the OS but that didn't help, all I got was grey screen and sometimes an Apple logo but no beach ball.

I couldn't get it to boot with an external OS, nor in target disk mode, not even when I pulled the hard drive. The hard drive mounted in an external enclosure no problem

I disconnected the Optical Drive and replaced the original hard drive and had a succesful boot right away..

Should I replace the Optical Drive, the O/D flex cable, both or neither? Why would the O/D affect the OS that way? thanks.
 

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