HP Workstation Z440 Tower

[4S1M3Y]

Hello there,

Tower would not boot

5x5 short beeps with red light at power button.

I replaced the motherboard; No solution

please help.

Thanks,

[SDH]

Try this:  Google "Z440 manuals".  Click on the top result.

Click on the Maintenance and Service guide link there...Save that to your desktop for later reference.

Open that PDF and search for "five beeps" (not "5 beeps")... that is a memory error, happening before the video card memory kicks in.

You often can fix this error by carefully cleaning both sides of the memory stick's gold plated contacts... I use high percentage alcohol... denatured alcohol (DNA)... 99% or 95%, which drug stores carry.  I clean with 100% cotton DNA alcohol-lightly-moistened lint free towel/rag, with the memory stick laying flat on a 100% cotton surface... no static allowed.  Clean both sides, contacts only.  Let them dry before reinserting... press down on each stick end equally as you replace them, and they are made to go back in one way only.  Use a flashlight to get things perfectly aligned before you press down, and after that I slightly wiggle them side to side to "seat" them in.

Your issue can be from volatile plasticizers from within the workstation that get outgassed into the case over time, and thereby degrade the memory contacts from communicating well to their matching thinner contacts in each memory socket.

Here is that manual:

http://h10032.www1.hp.com/ctg/Manual/c04823811.pdf

[DGroves]

also "Deoxit" gold is highly recommended, pricey but it works as advertised

https://caig.com/deoxit-gold-g-series/