HP Z820 Support Question
HP Z820 Support Question
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Question posted by JayF197919 on July 1st, 2014
Hp Z820 Won't Power On
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Current Answers
Answer #1: Posted by freginold on July 31st, 2014 4:41 PM
freginold
Member since:
December 20th, 2011 Points: 23,253,895
Member since:
December 20th, 2011 Points: 23,253,895
Often when a desktop computer won't turn on, it's because one of two components has failed: either the power supply unit or the motherboard (assuming you've ruled out the power coming in from the wall or surge protector as the problem).
Power supplies are generally not terribly expensive, compared to other components. If you're not getting any power at all, the power supply is a likely culprit. It's a much cheaper option to try than the motherboard. If you have a voltmeter or a power supply tester, you can check the power supply to verify that it's not supplying any power.
The motherboard is expensive to replace, so if you think the motherboard is the problem (if you've tried the power supply or ruled it out as the problem) it might be cheaper to get a new computer than have the motherboard repaired or replaced.
Power supplies are generally not terribly expensive, compared to other components. If you're not getting any power at all, the power supply is a likely culprit. It's a much cheaper option to try than the motherboard. If you have a voltmeter or a power supply tester, you can check the power supply to verify that it's not supplying any power.
The motherboard is expensive to replace, so if you think the motherboard is the problem (if you've tried the power supply or ruled it out as the problem) it might be cheaper to get a new computer than have the motherboard repaired or replaced.
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A
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HP Z820 Workstation components
HP Z820 Workstation front panel
Figure 2-5 Front panel components
Table 2-5 Component descriptions
1
Optical drive
5
2
Power button
6
3
Hard drive activity light
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4
USB 2.0 port (black)
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USB 3.0 ports (2, blue) Headphone connector Microphone connector IEEE-1394a FireWire connector
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HP Z420, Z620, and Z820 Workstation Series User Guide - Page 19
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Figure 2-6 Rear panel components
Table 2-6 Component descriptions
1
Power cord connector
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2
PS/2 mouse connector (green)
10
3
Audio line-in connector (blue)... (4, black)
Audio line-out connector (green)
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HP Z820 Workstation components 11
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Table of contents
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iii
Site preparation guide - HP Z800 Workstation 1110W power supply, HP Z820 Workstation 1125W power supply - Page 5
..., observe the considerations and limitations presented in the following issues: ● A fully loaded configuration might draw up to 115 volts, the HP Z800 Workstation 1110W power supply or the HP Z820 Workstation 1125W power supply are at least 87%/90%/87% efficient at 115V at 20%, 50% and 100% of rated output, respectively. The 1110W...
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... interruption. If the input voltage is less than 90 volts. The HP Z800 Workstation power supply is capable of continuously supplying 1250 watts of the UPS.
2
Power consumption and cooling
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Site preparation guide - HP Z800 Workstation 1110W power supply, HP Z820 Workstation 1125W power supply - Page 7
... or trip the breaker. Input current calculation
The 1110W power supply can safely provide the current required by using this input current calculation:
Input Current = Output Power / (Voltage x Power Factor x Efficiency)
Workstation
HP Z800
HP Z820
Output Power =
1110 watts
1125 watts
Voltage =
90 volts
90 volts
Power Factor =
0.998
0.998
Efficiency =
0.82
0.835
In this formula...
Site preparation guide - HP Z800 Workstation 1110W power supply, HP Z820 Workstation 1125W power supply - Page 9
....
● Asterisks refer to risk when using the workstation configured with a 1125W power supply. ● The workstation with an 850W power supply should be Power dissipation for the HP Z820 Workstation
The following table contains typical system configurations for an HP Z820 Workstation.
2x CPU Power
2x Midrange graphics 50-75W each (4) (5)
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