PC troubleshooting at a client site – First step for a computer that is completely dead (worked yesterday) You arrive and the PC shows no lights, no fans, and no beeps. What should be your very first check before proceeding deeper into hardware diagnosis?

Introduction / Context:
Field technicians are often called to sites where a previously working computer is now completely dead—no LEDs, no fans, and no POST beep. Efficient troubleshooting begins with simple, high-probability checks that isolate whether the problem is external power, the power distribution to the PC, or the internal hardware.

Given Data / Assumptions:

• The computer was reportedly working the day before.
• On arrival, there are no signs of life: no power LED, no fans spinning, no beeps.
• Standard office environment with potential power strips, surge protectors, or UPS units in the power path.

Concept / Approach:

Adopt a “outside-in” diagnostic strategy. Before opening the chassis or swapping components, verify power delivery from the wall to the PC. Human factors (switched-off strips, tripped breakers, loose cords) and facility issues (dead outlets) commonly cause “dead” symptoms. This step is fast, non-invasive, and can resolve many cases immediately.

Step-by-Step Solution:

Verification / Alternative check:

Use a receptacle tester or multimeter to verify outlet voltage. Bypass intermediary devices (plug PC directly into a known-good outlet) to eliminate UPS or strip faults. If the outlet is confirmed good and still no signs of life, then proceed to PSU jump-start testing or swap with a known-good PSU.

Why Other Options Are Wrong:

Testing the PSU is useful but should follow confirming AC power. Replacing the CMOS battery will not revive a stone-dead system. Reseating a storage cable is irrelevant when the system has no power at all. “None of the above” ignores the most common external cause.

Common Pitfalls:

Overlooking a master power switch on the PSU, daisy-chained power strips, or emergency power-off switches in labs. Assuming a UPS guarantees power—its outlet or internal battery may have failed.

Final Answer:

Check the AC outlet and power path (outlet, power strip, cord, switch) for actual mains power.