z620 rear fans spin too fast and make too much noise

[Stamatis Zografos]

Hi,

All of a sudden my trusted z620 has accelerated the reving of both rear fans, just under the PSU.

Made a google search, found a number of reports on fan reving, nothing on par with my case.

This is what I know so far:

1. No recent changes have been applied to either hardware, firmware, setup (F10) or software.

2. Computer has been cleaned recently, no dust traps are known to exist, nothing blocks internal ventilation anyhow.

3. Am getting no warning messages or beeps. Have inspected SYSLOG for anything unusual, none was found. Instead, other than the rear fans, everything seems to work flawlessly. Have inspected every known fan one-by-one, all were found reving normaly.

4. Have grounded myself and touched every internal surface by hand, none of them appeared to be hot, CPU included. Looks high fan reving is totally unjustified, at least temperature-wise.

5. Have disconnected every HDD, system won’t boot, yet problem persists. This is not a software issue.

6. Have removed every internal peripheral including the second processor riser card and even the VGA card. Problem persists. Am left to believe issue is MOT related, perhaps some faulty temperature sensor.

Should I replace mot for this?

regards

s

[Parvez_Admin]

Hi,

Z620 is a HP Product which is a different company. For HP products, you may have to register and post in the HP Support Forums: https://h30434.www3.hp.com/ or Please visit www.hp.com.

[Stamatis Zografos]

Hi,

many thanks for pointing me to the right direction. Will act accordingly.

regards

s