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david.buck.31945 0 Newbie Poster

“Just acquired an emachines mainboard ( imperial_g 20020828 ) with pentium 4 cpu 2.40 Ghz and canot source a manual anywhere - cannot see where power switch is located on m/bd ?!

Can anyone help?"

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Dani AI

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— imperial_g 20020828 boards do not usually have a large, obvious power toggle soldered to the PCB. The case’s front-panel pushbutton wires plug into a small two‑pin pair on a multi‑pin block (often labeled F_PANEL, FRONT_PANEL, PANEL or similar). The power-switch pins themselves are commonly annotated as PWRSW, PWR_SW, PWRBTN, PWR or just PWR on the silk‑screen and are typically placed along the lower edge of the board near the other front‑panel pins (HDD LED, PWR LED, RESET).

Quick, safe checks and bench steps:

  • Visually trace the thin two‑wire cable from the front of the case to the motherboard. The connector is small and may sit inside a 9–10 pin cluster.
  • With the ATX main plug and CPU 4‑pin connected and the PSU switched on at the rear, briefly short the two power‑switch pins with an insulated metal tool to simulate a press. A single short contact (not a prolonged short) should spin fans and start the board if the PSU and connectors are okay.
  • If nothing happens, verify that the PSU actually provides standby power (+5VSB present on the ATX connector) and that the PSU itself will run (the common paperclip/PS_ON-to-ground test can confirm this). Confirm the +12V CPU connector is fitted; a missing CPU power lead can prevent startup even when the front‑panel header is correct.

Cautions and context: short only the two front‑panel power pins (or PS_ON only when bench‑testing the PSU). Avoid random shorts to other pins. Use ESD precautions and keep the board powered down while moving connectors. OEM eMachines boards from that era often lack public manuals; the standard ATX front‑panel pinout diagrams will generally apply for locating and testing the power switch.

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