z820 won't boot

[scasparz]

Have an old z820. After switching the SATA cables between the SATA0 and SATA1 controllers, the computer powers off by itself at about one minute after powering on. During this one minute period, the power button remains normal blue, the fans operate normaly and as usual nothing is displayed on the screen. Computer then powers off just before it would normally display the circular HP logo. Of course I cannot F9 or F10 or even run anything.

Have tried a number of different VGA cards, two different PSUs, then disconnected everything (HDDs, CD-ROM etc) but a couple of DIMMs, none seemed to have any effect.

Please notice that the one minute timeout was standard on the normal -and successful- boot procedure before the problem occurred. During this period, was normal for the z820 to do nothing at all.

The first time the problem appeared, following the one minute timeout, the computer displayed kind of an on the fly menu by the upper left corner of the screen, I had never seen before. As I was planning to enter setup in a hurry. mistakenly I hit esc before I could read this menu contents. My bad. Computer then displayed the HP circular logo for the last time, but in a distorted aspect ratio -it appeared oval rather than circular-, then it switched off on its own, then rebooted before I would do anything. Ever since, after powering computer on and that one minute interval, computer switches off by itself and remains off. No red LEDs, no beeping sounds, it just dies.

Any ideas please?

regards

s

[Prométhée · Accepted solution]

hi

I'm not sure if this is a direct link.
changing the sata location can be a problem, because if you change the connector for the main HDD, the computer may not restart normally, boot problem
but a drop in the original connector and this must be adjusted
see the document here, where you can see precisely how the sata order must be configured

 HP Z220 SFF, Z220 CMT, Z420, Z620, and Z820 Workstations Maintenance and Service Guide

This document is quite complete, see the different steps that could help
but I am afraid here more of a problem due to handling, such as a problem of static electricity, quite frequent, this can damage the motherboard

https://support.hp.com/us-en/product/hp-z820-workstation/5225041/manuals

try clear cmos

[scasparz]

Many thanks Prométhée for your kind reply. In regard to the SATAs I had read the Maintenance and Service guide before, was aware of which is what, that had nothing to do with issue.

Had also cleared CMOS without effect.

But I would agree this problem is most probably static related. Meanwhile the issue got from bad to worse, as today computer absolutely refuses to switch on. Looks like I am for another MOT.

Again many thanks.

regards

s

[Prométhée]

Sorry
try to see a professional, we never know
ask for a quote, he may be able to try something..