Member Avatar for X25812-Rikku

I have a Presario 2100 that I’m trying to fix
every thing seems to be in good order have not taken it apart yet to look at every little thing right now if I press any of the muti media buttons on top of the keyboard it looks like its powering on the lights light up the fan turns on then a sec later its off if I remove the battery and put it back in or just use the external power supply it will start up then a sec later its off

sort of taking it apart to see what elts i can do i have tried every thing that i can think of.

thanks in advance.

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Dani AI

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described the classic symptom where the front LEDs and fan spin for a second and the machine then dies. That pattern usually means the embedded controller and standby power are working long enough to wake peripherals, but a required power-rail or "power‑good" signal fails before POST completes — in short, a board-level or power-circuit fault is more likely than a simple software problem. (daniweb.com)

Targeted checks that avoid unnecessary full teardown: inspect the top-case/power‑button assembly and the small flat flex/cable that plugs into the board — torn traces, crushed ribbon, or a bad connector are common. A safe diagnostic (battery removed, AC connected) is to momentarily short the two motherboard pins for the power switch (the same action the button does); if the system stays on when those pins are shorted, the physical switch or its cable is the fault. Take ESD precautions and document screw/connector locations with photos. (techwalla.com)

If shorting the header does not change the behavior, focus on the DC jack and nearby power regulation: a loose/cold‑soldered jack, cracked solder joints, or failing electrolytics can cause a rapid shutdown as protection circuits trip. The Presario 2100 service manual and DC‑jack/repair guides show connector locations and correct disassembly order — if the jack is soldered to the board, repair is more involved and may require soldering skills or a replacement board/assembly. (manualslib.com)

Practical notes: keep screws and photos organized, avoid prying clips, and do not attempt board‑level soldering without the right tools and experience. ’s earlier basic checks were good first steps; the focused tests above will narrow the fault to either the front-panel/switch, the DC jack/power circuitry, or a deeper motherboard failure so the correct repair path (top‑case replacement vs. board repair) can be chosen.

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Member Avatar for BuggZ

Make sure your AC Adapter is putting out the correct voltage. Remove the battery and disconnect the AC adapter. Press and hold the power button for 30 seconds. connect the AC adapter but not the battery and press the power button. If the laptop still won't power up then remove the AC adapter, remove the memory, and press the reset button on the bottom of the laptop using a toothpick or straightened paperclip. Put only one stick of memory back in (if you have more than one), connect the AC adapter and try the power again. If it still doesn't work, try different memory. If it still doesn't work after all this then it may be an internal problem. I have a 2100 that acts up every now and again and sometimes reseating the processor fixes the problem. These laptops are not much fun to take apart, lots of screws.

Member Avatar for X25812-Rikku

did not work do you have or know where i can find out infomation on how to take apart the laptop i tryed last night some thing was hanging up inside so i stoped and put it back

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