You are responsible for supporting faculty and staff endpoints, lab workstations, and the network path they use to reach internal services. A user reports that a laptop will not boot reliably, and a nearby workstation can boot but loses connectivity to internal resources after login. You have access to the device, switch port information, and central logs.
How would you troubleshoot these hardware and software issues to isolate the root cause, restore service safely, and avoid making the problem worse? Walk me through how you would decide what to check first, what evidence you would collect, and how you would confirm the fix.