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- z840 four beeps/red lights only after stuck shutdown screen

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07-07-2023 02:28 AM - edited 07-08-2023 02:19 AM
Hi, I have a z840 workstation.
I’m getting the four beeps and blinking lights roughly once a week:
But it only happens after a particular shutdown when windows 10 stays on the shutdown screen forever.
After I force shutdown by pressing the power button for 4 seconds, upon the next power up, I have the 4 blinking red light and four beeps, one seconds apart.
Restarting solves the issue.
I’ve also had occasional complete freeze/hang about once every 2 months. I’m testing different ram configurations thinking it could be a bad module. I’m also having one of the two screens showing interlaced artifacts once every 2 months that disappear when turning the affected monitor off and on again. I think this is a monitor issue.
I would rather be certain before buying a replacement part.
Any idea what could be causing the four red lights but only after the previous shutdown hanged?
thanks for your help