8100 Elite won't boot but fans are going flat out

[bsschuster]

Hi all,

My 8100 won't boot, I get no output to the monitor, and after about 12 seconds, the cpu and power supply fans speed up to maximum rpm.

I've reseated everything, and when I remove the ram, I get the 5 beeps as well as the fans speeding up to maximum rpm.

Any ideas on what is happening?

Regards,

Brenton.

P.S. This thread has been moved from Business PCs - Evo, Deskpro, Vectra, Kayak, Brio, e-PC to Business PCs - Compaq, Elite, Pro.

-HP Forum Moderator

[robinhp]

Hello,

I understand that the system is not POSTing. Please try removing the CMOS battery and all the RAMs in the unit. Power on the unit. If it beeps 5 times, Put one stick of RAM in the unit. You can try a known good RAM on it if you can get hold of one. If the unit still does not POST and the fan revs up high, I am afraid the system board will have to be replaced.

Thanks,

Robin

[VicKH]

The same situation. Spontaneous reboots were previously observed first once a half-year, then once a month, a week, a day... 🙂 RAM was tested (by the Memtest 86) and showed a lot of errors followed by the system hang up. Replacing the RAM gives no result. It was also observed, that sometime system boots in Windows, but hangs up upon any activity started.

HDD was checked - OK. Now it works fine in a different PC. Among the suspects are motherboard and PSU (power supply unit). OS (Windows 7) required re-activation, however. Compaq was a part of Agilent 7890/5975C GC-MS System.

Dear HP Support, how can MoBo be tested for operability? 

Is such MoBo available as a spare part? (HP Compaq 8000 Elite SFF, LGA 775, Q45) 8000E8S Euro.