Won't boot/no piwer

[Asm1026]

Probook 640 g1 model. Will not power 

The power/wifi/volume buttons flash when I try

On the bottom LED lights it's an amber white amber sequence flash

[Raqeeb26]

Hi @Asm1026 ,

If your HP ProBook 640 G1 is not powering on and you notice that the LED indicators on the power/wifi/volume buttons flash with an amber-white-amber sequence, it often indicates a hardware issue. Here is a systematic approach to troubleshoot this:

Step 1: Perform a Hard Reset

1. Disconnect External Devices: Remove all peripheral devices connected to the laptop.
2. Remove Power Sources: Disconnect the AC power adapter and remove the battery (if removable).
3. Perform a Hard Reset: Press and hold the power button for about 15 seconds to discharge residual power.
4. Reconnect Power Sources: Reconnect the AC adapter but leave the battery out.
5. Attempt to Power On: Press the power button and see if the laptop powers on. Follow below article: https://support.hp.com/th-en/document/ish_3974055-3873564-16

Step 2: Check the Power Adapter and Battery

• Verify the Power Adapter: Ensure the adapter is functioning correctly. You might try a different compatible adapter if available.
• Test the Battery: If the battery is removable, check the laptop's behavior without the battery installed. A faulty battery can sometimes prevent the device from powering on.

Step 3: Inspect LED Indicators

• The amber-white-amber sequence generally suggests an issue related to power delivery or a motherboard problem. Make note of how many times the sequence repeats, as this can assist in pinpointing specific error codes.

  Category	Major. Minor code
  BIOS	2.2
  BIOS	2.3
  BIOS	2.4
  Hardware (Memory)	3.2
  Hardware (Graphics)	3.3
  Hardware (Power)	3.4
  Hardware (Processor)	3.5
  Hardware (Processor)	3.6
  Thermal	4.2
  Thermal	4.3
  Thermal	4.4
  System Board	5.2
  System Board	5.3
  System Board	5.4

   https://support.hp.com/ca-en/document/ish_1997210-1528385-16

Step 4: Memory and Hardware Checks

• Re-seat Memory Modules: Sometimes the memory modules can get loose. Carefully remove and reinsert them.
• Disconnect and Reconnect Hardware: If comfortable, you could open the laptop to ensure all internal components are securely connected.

   Hope this helps solve your issue