Create an account on the HP Community to personalize your profile and ask a question
11-11-2018 11:58 AM
Product: Z800 Workstation
Operating System: Microsoft Windows 7 (64-bit)
Changed the 2N3903 temperture sensor but no effect on the fans. They all run as soon as I apply power. No video output. Tried three different cards, nothing. Tried 2 different PSU's. Get 3 beeps using one PSU and 4 beeps using the other PSU. Both PSU's work in other Z800 units. Changed the motherboard. Same problem, Changed the CPU's. Same problem.
Could the start button board IC cause this problem?
Repair manual beep codes lists 3 beeps = CPU ; 4 beeps = PSU overload BUT no red LED flashes that I can see.
Does anything plug into the IO/IO serial plug to get PRE startup failure codes? (Like a car computer does)
I'm flying blind here... H.E.L.P. please
1 REPLY 1
11-14-2018 10:38 AM
are the 2 power supplies the same wattage? a fully loaded system will require the 1250 watt unit instead of the stock 850
with that said, if the supplies work in another system and they past "BIST" self test
(attach just a pwr cord, fan should spin and red light on = good supply)
i would suspect you are not connecting, or mis connecting a cable somehow or perhaps not inserting the video card corectly or a damaged pci-e slot (try another slot for the card, using a known good video card)
when you replaced the aimbent temp sensor in the power cable, did you connect the two leads together on the transistor, and did you make sure the two leads were not swapped around?
Be alert for scammers posting fake support phone numbers and/or email addresses on the community.
If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".
Didn't find what you were looking for? Ask the community