Member Avatar for aljohno

Hi My daughter has a Dell inspiron 1501 and has just bought a new charger. When I plug it in and switch on it says 'Battery not recognised' After doing diagnostic tests I got the following error codes 4E36:0749 ivalid AC adaptor reported and 4E36: 0122 reporting disconected charger. The power light is flashing 3 amber and then 1 green light. Can anyone help please

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  • Latest Post Latest Post by donavonknight

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Practical checklist and interpretation to add to the troubleshooting already posted by , and . The replies point toward vendor/firmware routes; below are low-risk, diagnostic steps and what each outcome usually means.

  • Visual and physical checks first: confirm the adapter label (voltage/amps and part number) matches the laptop’s original adapter, inspect the barrel and center pin for bent/corroded pins, and check the cable near the connector for fraying. Do not open the mains adapter.
  • Power-reset the system: remove battery and AC, hold the power button ~30 seconds to discharge residual charge, then plug AC in and try to boot with the battery still out. If it runs on AC alone the adapter is supplying power but charging may still be blocked.
  • Swap or verify the adapter: try a known-good, compatible OEM adapter if available. Many symptoms come from adapters that lack the manufacturer’s identification circuitry; a physical match is not always enough.
  • Measure only if comfortable: check the adapter’s DC output with a multimeter and compare to the label. If the measured voltage is far off, the adapter is faulty. If the voltage is correct but the laptop still refuses the adapter, the issue is usually the adapter ID circuit, the DC jack/solder joints, or the board’s sensing electronics.
  • Battery checks: inspect the battery contacts and try booting without the battery installed. A battery failure can look similar to adapter-recognition faults.
  • Firmware and service note: firmware/embedded-controller updates can affect adapter recognition — apply vendor firmware only after confirming stable power and following the manufacturer’s instructions exactly. If all checks fail, the likely fixes are a genuine replacement adapter or a DC jack/mainboard repair by a qualified technician.

Safety note: avoid DIY mains repairs; when in doubt, seek professional service. This summary expands on earlier suggestions and focuses on low-cost tests before replacing parts.

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Member Avatar for caperjack

have you contacted dell ,they may have a quick fix for you !
check this info.

Member Avatar for donavonknight

There is an updated bios on Dell's website to fix this problem.

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