Strangely, getting stuck by way of the System reset switch results in a brief flash from Diagnostic LED 7 immediately after the flash from LEDs 2 & 3 which doesn't happen when simply restarting. Pressing the System reset switch doesn't yield a restart, rather inducing the problem and getting stuck. At the same time the optical drives click, Diagnostic LEDs 2 & 3 flash briefly & the process repeats as the power cycles trying to restart. When restarting, as the mac powers down, there's a click from the optical drive resetting as the power cycles and it's here where it gets stuck - right before powering back up. MacPro Original A1186 Dual-Core Intel XeonÄiagnostic LEDs reflect no issue and the Mac is working fine until needing to restart rather than shutting down.
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