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My computer has completely died, would not boot from startup botton on front of my computer, tried pulling main power plug and using different wall outlets too. I have replaced the small nickel sized battery also, I have held the power up front button for 5 to 7 seconds and still no luck. Is there a sequence startup procedure using keyboard too to get this thing working?

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Following and , the quickest path is a focused isolation of the power path and the motherboard front-panel. The ATX power handshake (PS_ON#) and the 5V standby rail are useful diagnostics when a PC gives absolutely no life; these details are described in the ATX specification and the PSU overview linked below [ATX], [Power supply unit (computer)].

  • Basic safety and inspection: disconnected mains and an anti‑static strap are recommended before opening the case. Look for obvious damage (burn marks, bulging capacitors, loose front-panel wires) and note whether any motherboard LEDs or fans show faint activity when the unit is plugged in.
  • Isolate the PSU electrically: a known-good mains lead and a bench PSU swap are the fastest ways to separate cable/PSU problems from motherboard faults (as suggested). A controlled PS_ON# jump (green wire to ground) will start most ATX PSUs for testing; use a meter to confirm the 5VSB and main rails rather than relying on fan spin alone.
  • Narrow the motherboard/front-panel: if the PSU is confirmed live but the board still shows no activity, check the front-panel power header and the case switch (shorting the power pins with a screwdriver can momentarily simulate the switch). If no POST LEDs or speaker beeps appear, the board is likely the next suspect.

Cautions: live mains work and PSU internals are hazardous. When in doubt, use a PSU tester, borrow a known-good unit, or seek shop-level diagnostics. Reliable background on ATX signals and PSU behavior is at the ATX and PSU pages below.

ATX
Power supply unit (computer)

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Member Avatar for caperjack

possible that the power supply died

Member Avatar for sparkax

Have you tried a new lead ?

Edited by sparkax because: typo
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