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I have a Dell Latitude E5420. When I try to boot, I get the bios splash screen after which I only get a black screen and the drive activity light is also off. After trying to boot for a couple times the activity light starts to blink and windows boots successfully. Also if I am lucky windows boots on the first try.

When I tried to boot today I got a warning saying battery is low press f1 to continue I pressed F1 and windows successfully booted and when I checked the battery percentage it was at 73%.

These are the following things I have tried:

  1. Trying automatic windows repair
  2. Freshly installed windows
  3. ATX reset - by removing the baterry and charging cable and holding the power button for 30 seconds
  4. Running on mains power - Got stuck on black screen after bios splash screen

Also I tried booting with the charger plugged in and without the charger being plugged in I get the same problem every time.

Is it a hard drive issue or power supply issue or maybe motherboard issue? I'm totally confused.

Thanks for your time

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    The likeliest (and cheapest) first try will be to get a new battery.
    – harrymc
    Commented Oct 19, 2021 at 9:32
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    It makes a lot of sense that the battery is damaged and is self-discharging causing your issues - along with misleading readings.
    – davidgo
    Commented Oct 19, 2021 at 9:51

1 Answer 1

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All my previous laptops were able to run on mains only - without a battery. Please try using your laptop to run without the battery to rule out the battery as a possible cause.

When running your laptop with a battery disconnect the mains power supply. How much does the battery percentage gauge drop?

Increased internal resistance of your battery can produce misleading results about remaining battery capacity.

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  • I tried running it on mains only but it got stuck at the black screen after bios splash screen... And about the battery I have used my laptop for 2 3 hours disconnected from mains power i.e. on battery backup
    – Prabodh
    Commented Oct 19, 2021 at 13:56

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