After an overnight maintenance window, a rack-mounted Linux application server will no longer power on. Remote IPMI reports the chassis power state as off and refuses a "power on" command. An on-site technician confirms that the server's AC cord is seated, the outlet has voltage, and the PSU input LED is green, but the PSU output/fault LED is solid amber. Pressing the front-panel power button produces no response. Which corrective action should the administrator take FIRST to restore service?
Repair filesystem corruption on the root partition with fsck.
Replace the failed hot-swap power supply module with a known-good unit.
Clear the CMOS and load BIOS defaults to recover from firmware corruption.
Boot the system with rescue media and reinstall the GRUB2 boot loader.
A solid amber (yellow) output/fault LED on a server-class hot-swap PSU indicates that the module has failed or shut down because of an internal fault. Vendor troubleshooting guides recommend performing a "swap test"-replacing the suspect PSU with a known-good unit-to verify and restore power before investigating other components or operating-system issues. Actions such as repairing GRUB, running fsck, or clearing CMOS do not address a hardware PSU fault and cannot be performed until the server actually powers on.
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CompTIA Linux+ XK0-006 (V8)
Troubleshooting
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