⟐ Answer accepted November 08, 2016 at 15:33 MST

⟐ Answered February 08, 2023 at 12:57 MST

⟐ Answer accepted November 08, 2016 at 15:36 MST

I timed the intervals between each turn-off and it is about 25-30 minutes.

When pressing the power button once, sometimes it will light up (along with the other lights of the laptop) and then will switch off, then will light up again and the computer will start up normally. I use windows 10.

The power supply has been replaced, the battery changed, power cable changed, the inside has been cleaned, I've scanned for viruses, and I had even reset all settings and data on the laptop.

My apologies if I missed an obvious solution, I'm not the best when it comes to technology!

I stopped using it for a few months because the problem got so irritating, and the problem had stopped for a short while. The issue has returned and I would appreciate any help/suggestions.

Thank you!

⟐ Commented November 08, 2023 at 3:37 MST

⟐ Commented November 18, 2025 at 0:49 MST

⟐ Answer edited January 19, 2025 at 13:23 MST

1. bootmgr image is corrupted. the system cannot boot

2.Boot Device not found

3.Werfault.exe error

4.taskhost.exe error

screenshot attached for reference.

⟐ Answered June 29, 2018 at 0:52 MST

⟐ Answer edited January 27, 2026 at 7:44 MST

⟐ Commented December 30, 2025 at 19:10 MST

⟐ Answered November 22, 2025 at 15:22 MST

⟐ Answered July 04, 2025 at 20:39 MST

⟐ Answered October 15, 2024 at 23:23 MST

⟐ Answered July 18, 2023 at 1:10 MST

⟐ Answer edited August 25, 2020 at 22:08 MST

⟐ Answer accepted September 04, 2017 at 5:22 MST

⟐ Commented July 08, 2024 at 4:23 MST

So, my laptop probook 4540s was working perfectly fine until like 2 weeks ago. That day I had an issue when I plugged the AC adapter and the LED that is on top of the ac jack flashed white, the pc turned on but the battery wasnt charging. I looked it up online and solved it by hard reseting by pressing the power button 15 secs without the ac adapter plugged or the battery.

After that I had no problems until 4 days ago.

This time I was using my laptop as usual in the morning and then hibernated it and went to get food, when I came back I tried to turn on the laptop but I couldn't, when I pressed the power button the only thing it did was that the power button light up, the fan sounded like it was spinning at full speed, the screen was pitch black and after 5-10 secs it shut off. If I tried to to hard reset and nothing. The weird thing is if I left the pc alone after several hours and tried to turn it on, it worked properly but if I hibernated it or shut it off the problem appeared again.

I looked online and I saw in forums that it could be

1. The laptop was overheating, that could explain why it shut off by itself and why it worked after leaving it and trying hours after or 2. The BIOS was corrupted and registering a wrong temperature.

So I opened the pc, I dusted it off, removed the heatsink and cleaned it, reapplied thermal paste to the CPU and external graphic card, also I disconnected the CMOS battery for 5 min to reset the BIOS.

I then put the laptop together and to my surprise when I connected the battery or plugged the AC adapter, the pc turned on by itself but now the fan didnt spin, the screen was black, the power button LED lighted on, the HDD led blinked but very dim. Again after 5-10 secs it shut off by itself but instantly turning back on, stuck in a cycle.

One thing I noticed is that the fan was trying to move but it couldnt, like it was also "blinking".

I tried hard reseting but nothing.

I hope I dont messed up any hardware, when I opened the pc up I saw tutorials and were very careful, everything went smooth.

I'll appreciate any help.