E540 Power Issue

[Colinmi]

Hello,
I'm new here and am hoping to get a little help from some of you more experienced with these E series machines. Hopefully sometime in the future I will be able to return the favor.

I have an E540 here with the proper Lenovo AC adapter but no battery. When I try to power it on I just get the red dot to light in the ThinkPad logo but nothing else. Do I need a battery connected to get it started or should I start looking for some other issue? There are no beeps and I have connected an external monitor to be sure that it is not just a dead screen.
The manual did not say whether a battery was required when running on AC.

Thanks,

Colin

[BigglesFlysUndone]

I have an E540 here with the proper Lenovo AC adapter but no battery. When I try to power it on I just get the red dot to light in the ThinkPad logo but nothing else. Do I need a battery connected to get it started or should I start looking for some other issue? There are no beeps and I have connected an external monitor to be sure that it is not just a dead screen.
The manual did not say whether a battery was required when running on AC.

Thanks,

Colin

Colin,

The E540 should boot fine without a battery using the AC Adapter. You should at least get a POST.

Be sure the AC Adapter isn't faulty before proceeding.

[keoagkop]

I'll just continue this thread with my own case, in order not to create redundant threads.
My ThinkPad E540 never had any Problems, until yesterday.
I don't know whether this is related to the problem, but I am currently developing an OS of my own and I run it on my Edge using an USB stick. I ran into some unexpected behaviour some days ago (vram suddenly filled with random characters) and shut down the Edge manually (Power button).
When I tried to restart it, i got a FAN ERROR, which I solved by resetting the CMOS battery.
After that, I was able to boot into Windows again.
But since shutting down the Laptop again (using Windows shutdown button), whenever i start the laptop, only the Power LED on the lower right lights up.
The Screen does not get any Power (the background lights are off). I connected the Laptop to an external monitor but it doesn't get any signal.
When pressing the Power button to shutdown the Laptop from this "frozen" state, nothing happens, and I have to press it for several seconds or unplug the power cable. (A short beep sound occurs when i do that).
Unplugging the power cable and pressing the power button for 30 seconds did not change anything as far as I observed.

Thanks in advance

[keoagkop]

Status update:
I resetted my CMOS battery once again and have not yet run into further troubles. Booting went fine.
I'll post again when I encounter the same problem again.