Pro book 640 g1

[Bk1990]

Hi, 

I've  a ProBook 640 g1 win 10 that's stuck in a boot loop. It goes all the way to the windows logo and sometimes even able to log in before getting a Stopcode: Irql not less or equal blue screen error. And freezing. It’ll then it power cycles several times and repeats. 

I ran a hardware diagnostics and it  brings up "Memory Quick Check : FAILED" with FAILURE ID :og8421-a6kc3p-0g8421-804r03

What could be the problem? 

[Paul_Tikkanen · Accepted solution]

Hi:

You will need to replace the failed memory chip.

Below is the link to the service manual, where you can find the memory removal and replacement procedure.

h10032.www1.hp.com/ctg/Manual/c04823617.pdf

I don't know what capacity memory chip failed but this 8 GB chip should be a compatible replacement:

Amazon.com: Crucial RAM 8GB DDR3 1600 MHz CL11 Laptop Memory CT102464BF160B : Everything Else

The notebook supports 2 x 8 GB of memory.

[Bk1990]

Thank you for the quick reply. I will replace the memory and will post the results. 

[Paul_Tikkanen]

You're very welcome.

[Bk1990]

Update: solution worked perfectly. After replacing the memory stick in slot one everything was back to perfect working order. Many thanks. 

[Paul_Tikkanen]

Anytime.

Glad to have been of assistance.