Member Avatar for bdjessie

My presario2135us stopped responding to anything. After I plug in new ac adapter the computer seems to get power but the power light just pulses like its stuck in standby mode. I can hear the fan come on when it gets warm but I can not get it to boot or do any thing.

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Short, practical checklist to help narrow this down.

thanks for the description and for the follow up question — because the unit shows signs of power but never completes POST, try the steps below in order and stop when something changes. Report beep/blink patterns or any voltmeter readings you get; those details are very helpful.

  • Power reset: shut down, remove AC and battery, then hold the power button 20-30 seconds. Reconnect AC (leave battery out) and try to power on.
  • Check the adapter: verify the adapter label matches the laptop's required output and, if you can, measure it with a multimeter. If available, try a known-good compatible adapter.
  • Minimal hardware boot: remove HDD, optical drive and any peripherals. Remove all but one memory module (try each module and each slot). Power up with the bare minimum.
  • Reseat and clean memory and connectors: pull RAM, reseat firmly, and clean contacts gently with a soft eraser if oxidized.
  • External display test: attach an external monitor to rule out LCD/inverter failure.
  • CMOS reset and visual inspection: remove the coin cell for a few minutes (if comfortable doing so) and inspect the DC jack, power button, and motherboard for burn marks, swollen caps or a loose jack.
  • Data-first fallback: if you need files, remove the HDD and connect it to another PC with a USB adapter/enclosure for recovery before further repairs.

Cautions: always disconnect power and remove the battery before opening the case; ground yourself to avoid static damage. If none of the above changes the behavior, the problem is likely on the power or motherboard level and will need a repair shop or board replacement. Please post any LED blink counts or beep codes you observe.

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Member Avatar for chrishea

Is the machine shutting itself off and on or is it truly staying on with the "pulsing" power light.

Member Avatar for bdjessie

staying on all the time

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