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crent 0 Newbie Poster

This is a solved problem worth sharing:
After replacing power connector on back of laptop it wont start, so tried everithing posted in this forums in order to make it start but it will not go pass the lights blink part and blank screen, even put heat paste on cpu just to get fans to stop running or slow down, nothing worked. But this morning i took it appart and did some cleaning on motherboard using just a brush and no cleaners but when removing the heathsink for the cpu the cpu stick to the heatsink because of the heat paste applied previously, after removing the cpu and trying to put it back to cpu socket was noticed that the socket lock was not fully closed, so using a small slot screwdriver it was managed to get fully seated on socket and lock fully closed. After doing that and re-assembling the unit it started, fans ran only for a couple of seconds and stop and it went to fully load windows. After that the fans start and stop only when cpu is hot.

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This thread documents a repair where the underlying fault turned out to be a mechanical contact/locking issue rather than an electrical failure. 's outcome highlights a common reality: after any board-level work, a missed or damaged mechanical connection (socket lock, contact pins, fan/header, screw torque) can produce symptoms that look like a dead board. The following concise precautions and checks reduce risk and make diagnosis faster.

  • Work safely: remove power and battery, ground yourself, and keep screws/parts organized and photographed.
  • Inspect visually before powering: use a loupe to check socket pins or pads, connector housings, and the fan header for bent pins, debris, or damaged plastic.
  • Removing/heatsink handling: break the thermal bond with a gentle twist; clean old compound with 90%+ isopropyl alcohol on a lint-free wipe. Apply a thin, even layer of fresh thermal compound — too much spoils contact.
  • Reseat procedure: align orientation marks, lower the CPU straight in, and engage any ZIF lever or retention clip without forcing. Tighten heatsink screws incrementally and in a cross pattern to avoid board warp.
  • If the system still fails: test with minimal parts (no HDD, single RAM stick), reset CMOS/EC, check fan and CPU temps in BIOS, and look for POST/beep/LED codes before assuming component failure.

Cautions: do not lever metallic tools into delicate socket mechanisms; avoid heating or bending pins yourself if they are damaged — professional repair or board replacement is safer.

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