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Z420 won't boot after upgrade to 8GB ram

Z420
Microsoft Windows 10 (64-bit)

I am trying to add some more 8GB RAM (MT16KTF1G64AZ-1G9P1). It won't boot fan run loudly with no video. Please advise!

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Z420 won't boot after upgrade to 8GB ram

> Posted: ‎06-01-2017 08:56 PM

> I am trying to add some more 8GB RAM (MT16KTF1G64AZ-1G9P1).
> It won't boot fan run loudly with no video.
 
When you power-on your computer, the fan spins at 100% of its speed, and, of course, its noise.
The POST (Power On Self Test) should start, and should measure the temperature of the computer.
If the computer is literally "cool", it should tell the fan to slow down, and, of course, to make less noise.
As the POST runs, you should get some video-output.
So, my guess is that the POST has not started, which implies that the motherboard has failed.
 
If your computer's HP Warranty still is valid, contact HP, to exercise the warranty.
Otherwise, you must either replace the motherboard, or replace the whole computer (after cannibalizing the RAM & the disk-drive & CD/DVD device).
 
 
 
 
 
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Z420 won't boot after upgrade to 8GB ram

Greetings,

Welcome to the forum.

I am not a HP employee.

 

Your PC requires DDR3, UDIMM (Unbuffered), ECC memory. The supported memory speeds are: 1066-MHz, 1333-MHz, and 1600-MHz DDR3.

 

You purchased non-ECC DDR3 memory (Link to memory specifications) running at 1866 MHz. 

 

The new memory is not compatible with your motherboard. You will have to return this memory to the seller.

 

I would try Crucial Memory (Link) for compatible memory. Select your PC's product number from the drop down lists or use the memory scanner. You can also check HP Part Surfer (Link) for compatible memory modules.

 

Use your PC's product number instead of the generic Z420 ID at HP Part Surfer to zero in on your specific system.There are many Z420 systems.

 

Regards

 

 

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Z420 won't boot after upgrade to 8GB ram

You purchased non-ECC DDR3 memory (Link to memory specifications) running at 1866 MHz. 

 

The SPD (Serial Presence Detect) chip on most sticks of DDR3 RAM defines the various speeds that are compatible with the RAM.

For example:

 

Type~DDR3
Size~4096 MBytes
Manufacturer~Corsair
Max Bandwidth~PC3-10700H (667 MHz)
Part Number~CMX4GX3M1A1333C9
Week/year~25 / 10
Timing table
~Frequency~CAS# Latency~RAS# To CAS#~RAS# Precharge~tRAS~tRC~Voltage
~~JEDEC #1~444.4 MHz~6.0~6~6~16~23~1.500 V
~~JEDEC #2~592.6 MHz~8.0~8~8~22~30~1.500 V
~~JEDEC #3~666.7 MHz~9.0~9~9~24~34~1.500 V

 

Do you see that while the maximum bandwidth is PC3-10700H (667 MHz) 

this stick of RAM is capable of operation at either or 2 slower clockings.

 

There is an extremely-strong possibility that the SPD on your 1866 MHz RAM also defines a compatible lower clocking, namely one that is compatible with your motherboard.

 

But, check the number of RAM chips on your sticks, e.g.,4 or 8 per side, and either single-sided or double-sided, and compare that with any RAM that does work on your motherboard.

 

 

Also, if you "mix" different speeds of RAM, put the slowest RAM into slot #1.

That way, the motherboard may clock all the RAM at that slowest speed.

Putting the "fast" RAM into slot #1 may cause problems, if "slower" RAM is in the higher-numbered slots.

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Z420 won't boot after upgrade to 8GB ram

Hi,

 

It appears Abelna may have purchased incorrect memory.

 

Abelna, please go back to the HP factory hardware configuration.

 

Tell us if your PC can boot to the Windows Desktop after reinstalling the factory RAM.

 

Regards

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