45P17ES#UUW

[TK25891]

When I start the computer, it turns into a black screen and Caps Lock flashes 5 long white flashes and 3 short white ones, what kind of error code is this on the computer?

[BeemerBiker]

Beep codes and reset instructions
Click here for Laptop codes

This condition indicates that the embedded controller cannot reach the BIOS within the established time limit.

What caused the problem in the first place?
Power glitch? Upgrade to windows 11?
Microsoft or HP update? Add a new device, memory, etc?
BIOS upgrade that went wrong?

Does not look good.  BIOS boot loader not responding is my guess.

Try clear CMOS and do a hard reset

Follow the steps below to reset computer CMOS data.

1. Turn off the computer.
2. Press and hold the Windows and the V keys.
3. While still pressing those keys, press and hold down the Power button on the computer for 2-3 seconds.
4. Release all the keys.
5. At the completion of a successful CMOS reset, a message showing CMOS Reset (502) will be displayed.
6. Restart the computer.
7. Press F10 to get in to bios. Check Date and time.
8. Press F9 to set bios defaults. Ensure secure boot is enabled.
9. save setting when you exit

If you do not see that 502 message then :

• Turn on the computer by holding the power button down for 20 full seconds then release.
• Press the Power button one more time (if necessary) to start the computer.
• Tap the ESC key about once a second after you see the LEDs on the keyboard flash.
• Do steps 7-9 above

If this did not help then try the BIOS recover

HP support video for bios recovery

Click here to see how to recover your BIOS.
Do 1, 2, and the first part of 3.
For the second part of 3 you will need a USB flash drive and possibly an
older BIOS if the recent BIOS caused the problem. Make sure the USB flash had LED lights.

For laptops, step 2 "CMOS reset" there is no cmos battery nor cmos switch and no need to open the laptop. Use the Windows key + 'v' as explained here.

To install from USB.
When you power up your system the leds on the flash drive should flash once at the instant power is applied. They will then flash about three to five seconds later (hopefully). When they flash a second time that means the files are being read from the flash drive. If you never see it flash a second time then the boot loader is damaged and you cannot recover the bios unless you use a programming tool or replace the chip. You hold down the win+B key when powering up with the USB flash inserted.