Use a Firewire cable and connect them. Start the one up that you are having issues with holding down the "T" key. Start the other machine up normally. The hard drive icon should appear on your desktop and you can then run Disk Utilities on it.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!