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laptop restarts every 2-3 seconds.I try replace ram , procesor, harddisc..
Please help

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As has already swapped memory, CPU and the drive and cannot reach the BIOS, the fault is almost certainly board-level or power‑related rather than a removable component. 's battery‑remove/AC‑only check is a good quick test; beyond that, focus on the power circuit, BIOS/EC reset, and minimal POST diagnostics.

Try these practical steps in order:

  • Power-reset sequence: remove main battery and AC, hold the power button 20–30 seconds, then plug AC back in (no battery) and try to power up.
  • Minimal hardware: disconnect HDD, optical, wireless card and all peripherals. Boot with only the CPU, heatsink, and one RAM stick (try each slot and stick).
  • CMOS/EC reset: remove the CMOS coin cell for a minute (or unplug the EC/BIOS battery if present) to clear settings. Re-seat connectors and ribbons.
  • Check the power source and jack: verify the adapter voltage against its label with a multimeter and wiggle the DC jack while powered to watch for reboot triggers. A loose/worn jack or bad solder joint commonly causes cycling.
  • Visual inspection: look for bulging or leaking electrolytic capacitors, burnt components, or cracked solder around the jack and voltage regulator area. Also check the power button cable for shorts or stuck contacts.
  • POST indicators: listen for beep codes or watch LED blink patterns; they often point to missing RAM or early POST failures.

If none of the above helps, the motherboard (voltage regulators, EC, or BIOS chip) is likely failing. Board‑level repair shops can replace caps, MOSFETs or reflash/reball chips, but costs may approach buying a replacement board or machine. Recover any important data by removing the drive and using a USB adapter before pursuing full repair. ESD precautions and basic safety are recommended; advanced soldering or reflow work should be left to professionals.

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Member Avatar for CelestialDog

I had a toshiba satellite laptop which did the same thing until I removed the battery and powered it straight from the mains, so you may want to try that first.

Can you get into the laptops bios settings?

Member Avatar for max2711

laptop restarts every 2-3 seconds.I try replace ram , procesor, harddisc..
I can't get into the bios
This is hardware error, something on the motherboard but I don't now what

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