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MO_Bob
Paper Tape
Posts: 3
Registered: ‎01-21-2019
Location: US
Views: 244
Message 1 of 2

R400 won’t restart on AC power

Hello!  I have an R400 that won’t restart when the power adapter is connected.  If a restart is attempted with the adapter connected, the status lights just cycle through repeatedly (hdd, caps, numlock, batt, etc).  As soon as the adapter is disconnected, the restart will resume.  Once the restart resumes, the adapter can be reconnected and the restart will continue. The adapter will charge the battery adequately.

I have another R400 that’s fine from which I’ve tried the adapter and battery.

On the problem laptop, I’ve tried a known good different hard drive with a fresh install of Win 10.

I suspect a hardware problem of some sort but I don’t want to shotgun it if you know what I mean.

Thoughts?

Thank!

MO_Bob
Paper Tape
Posts: 3
Registered: ‎01-21-2019
Location: US
Views: 167
Message 2 of 2

Re: R400 won’t restart on AC power

I picked up a used motherboard online and it solved the problem. Interesting note after installing the “new” MB... the display brightness changes and the system “beeps” when plugging/unplugging the power adapter.  I hadn’t paid attention to that before. 

Problem solved!

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