HP m9340f Support Question
HP m9340f Support Question
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Question posted by mgahgan on May 7th, 2010
Replaced Motherboard And Upgraded Power Supply. Now Computer Will Not Power Up.
Replace defective mother board with new OEM replacement board. Also upgraded the power supply. Now the computer will not power up, no power supply fan comingon. I have check board connections three times. Computer is an HP Media Center PC m9340f, model KQ497AA-ABA.
Current Answers
Answer #1: Posted by kcmjr on May 10th, 2011 10:51 AM
kcmjr
Member since:
May 5th, 2011 Points: 4,254,255
Member since:
May 5th, 2011 Points: 4,254,255
Please be extremely careful. You can get shocked and/or you can burn out the power supply if you do this wrong. I take no responsibility for any damage done by following this advice.
You can turn on an ATX power supply by shorting two pins together.
Disconnect the large connector from the motherboard but leave the disk drives connected. PC power supplies use switching technology and require that at least some load be present.
By shorting the green wire and one of the black wires you simulate the motherboard powering on the power supply.
Look at the diagrams in this link: http//www.smpspowersupply.com/connectors-pinouts.html
The text on the link page explain how to turn on the supply without the motherboard. Basically you use a bent paper clip to short out pins 16 and 17. Pin 17 is ground and pin 16 is the "power on" sense line on the newer version 2 connectors.
Make sure to turn on the main power switch on back if there is one. If the disk drives start up the power supply is more than likely OK. Try removing the motherboard from the PC and powering it up that way. If it still will not power up the board is bad. I've seen this more times than I can mention. Manufacturing quality varies and it's quite common get a bad board out of a new box.
There is also the possibility that one or more of the mounting screws has either shorted out on a circuit trace or is too tight causing an internal short on the motherboard. Try loosening the screws and see if that helps.
Here is a YouTube video showing how to do it. Be warned the audio on this video is quite annoying: https://www.youtube.com/watch?app=desktop&feature=related&v=weroTqTMPl4
Licenses & Certifications: Microsoft, Cisco, VMware, Novell, FCC RF & Amateur Radio licensed.
Related HP m9340f Manual Pages
Safety and Regulatory Information Desktops, Thin Clients, and Personal Workstations - Page 5
... Battery Replacement Notice ...2 Headset and Earphone Volume Level Notice 3 German Ergonomics Notice ...3 Laser Safety ...3 CDRH Regulations ...3 Compliance with International Regulations 4 Laser Product Label ...4 Laser Information ...4 Power Supply and Power Cord Set Requirements 4 Power Supply Class I Grounding Requirements 4 Denmark ...4 Norway ...4 Sweden ...5 Power Supply Requirements...
Safety and Regulatory Information Desktops, Thin Clients, and Personal Workstations - Page 8
... moving parts may contain an internal lithium manganese dioxide, vanadium pentoxide, or alkaline battery or battery pack. Disconnect power to the input supply.
Installation Conditions
See installation instructions before connecting this product. WARNING! Battery Replacement Notice
WARNING! There is risk of explosion if battery is not handled properly.
In order to forward them to...
Safety and Regulatory Information Desktops, Thin Clients, and Personal Workstations - Page 10
...Numerical Aperture: 0.45 +/- 0.04
Power Supply and Power Cord Set Requirements
Power Supply Class I Grounding Requirements
For protection from fault currents, the equipment shall be connected to the Class 1 Laser Product...LS-260 drive, this product or a Hewlett-Packard authorized replacement. Only use the power cord supplied with appropriate safety standards including IEC 825. Denmark
For ...
Safety and Regulatory Information Desktops, Thin Clients, and Personal Workstations - Page 11
... in Japan, use in a shock and fire hazard.
ENWW
Power Supply and Power Cord Set Requirements 5 Power supplies on some products have external power switches are applicable to all countries:
1. For Use in any manner, replace it is not likely to operate from any other products.
Mismatched power cords may be found at http://www.hp.com/cgi...
Getting Started Guide - Page 101
... has USB 1.1 ports, use two USB ports to a USB 2.0 connection. NOTE: The HP Personal Media Drive comes with a fan. When connecting the drive to a computer without a drive bay, the HP Personal Media Drive requires a separate power supply in fan;
HP Media Drive fronts
A Drive activity indicator light
B Power on indicator light
C HP Personal Media Drive guide ridges...
Limited Warranty and Support Guide - Page 12
... Upgrading and Servicing Guide may result in your safety, always unplug the computer from its power source...exposure. WARNING: Use of antenna-discharge unit, connection to the Radiation Control for the grounding electrode...require maintenance, contact an authorized service location.
Replace only with the cover removed. Department of ...power supply and modem of the CD or DVD drives.
12
Limited Warranty and Support Guide - Page 14
..., plug your computer's main AC disconnecting device and must be connected to grounding system of the building, as a "Class 1 Laser Product" under a U.S. Laser Safety Statement Class 1 LED Product
The CD and DVD drives contain a laser system and are inside the power supply and modem of cable entry as to the correct voltage setting...
Limited Warranty and Support Guide - Page 14
...System Installer This reminder is incorrectly replaced. The voltage select switch has been...power supply and modem of 1968. Failure to do not try to open the enclosure of antenna-discharge unit, connection to grounding electrodes, and requirements for use in hazardous radiation exposure. Dispose of controls, adjustments, or performance procedures other than those specified in the Upgrading...
Getting Started - Page 138
... does not require a separate power supply because power is required. NOTE: USB 2.0 uses only one USB connection is supplied through the USB 2.0 connection. If the computer has USB 1.1 ports, use both USB connectors. 3 Install the software and drivers. When connecting the drive to a computer without a drive bay, the HP Personal Media Drive requires a separate power supply in fan;
Getting Started - Page 101
... does not require a separate power supply because power is supplied through the USB 2.0 connection. NOTE: The HP Personal Media Drive comes with a built-in addition to insure that enough power is supplied. Most USB 2.0 ports can supply enough power so that you connect by using a USB 2.0 cable. the HP Pocket Media Drive does not come with a fan.
HP Media Drive fronts...
Getting Started Guide - Page 138
... requires a separate power supply in fan; If the computer has USB 1.1 ports, use both USB connectors. 3 Install the software and drivers. The HP Pocket Media Drive does not require a separate power supply because power is supplied. USB 1.x systems use two USB ports to insure that enough power is supplied through the USB 2.0 connection. Most USB 2.0 ports can supply enough power so that...
Upgrading and Servicing Guide - Page 18
..., replace the side panel, and close the PC. Connect to the PC motherboard. 5 Complete the procedures to a primary hard disk drive. Connect to the back of the HP Pocket Media, diskette (floppy), or hard disk drive. See "Opening and Closing the PC" on page 1.
14 Upgrading and Servicing Guide
A
B
MASTER
C
SLAVE
To CPU
A - 4 Connect the power and...
Upgrading and Servicing Guide - Page 29
... graphics card upgrades. A flat-head and a Phillips screwdriver are needed to remove, replace, or add an add-in card slots filled) must not exceed the total number of
+5 Vv power for more information about power supply requirements. The total +5 Vv current
draw in a fully loaded system (one with the graphics card supplier for each board/card...
Upgrading and Servicing Guide - Page 31
Upgrading and Servicing Guide 27 The whole connector should be seated properly in the card slot... the chassis upright. 4 Complete the procedures to the card, power supply, keyboard, and monitor. NOTE: If the new card or device isn't working, read through the card manufacturer's installation instructions and recheck all connections, including those to replace the side panel, and close the PC.
Upgrading and Servicing Guide - Page 32
... fails, replace it with the same, or equivalent, type of battery. See "Opening
and Closing the PC" on the motherboard provides backup power for the...replace the side panel, and to weaken, the date and time may be incorrect.
Replace only with a CR2032 lithium battery (3 volt, 220mAH rating) or an equivalent battery. Replacing the Battery
A lithium battery on page 1.
28 Upgrading...
Upgrading and Servicing Guide - Page 18
... Drive bay or hard disk drive. See "Opening and Closing the Computer" on page 1.
14 Upgrading and Servicing Guide 4 Connect the power and data cables to the computer motherboard.
Connect to a primary hard disk drive. Parallel ATA drive
5 Replace the front and side panels, and close the computer. Connect to a secondary hard disk drive (select models only).
Upgrading and Servicing Guide - Page 31
... slots multiplied by two amps. The computer is a circuit board, such as a PCI, PCI-E, or AGP card, that draw excessive current.
You need a flat-head screwdriver and a Phillips screwdriver to your computer. NOTE: A power supply upgrade may be used to add components to remove, replace, or add an add-in card slots that can be...
Upgrading and Servicing Guide - Page 35
.... 6 Install the new CR2032 battery in the socket, with the positive (+) side facing the
latch. 7 Replace any memory modules, if necessary, so that you can reach the battery. See "Opening and Closing the
Computer" on the motherboard provides backup power for the computer timekeeping capability. Replacing the Battery
A lithium battery on page 1.
Upgrading and Servicing Guide...
PC Troubleshooting - Page 10
...must be connected to the Internet to the Audio Out (green) connector on the back of the computer.
6 Troubleshooting and Maintenance Guide Replace the non-powered speakers with powered speakers. If... the correct codec is very low or unsatisfactory.
If the correct codec is not available, check to see whether ...
PC Troubleshooting - Page 22
... disk drive data and power cables. For instructions, refer to the Upgrading and Servicing Guide. Computer does not turn it on the back of the computer should start . Possible solution
Ensure that cables connecting the computer to contact Support. Connect the monitor to the computer, plug it is functioning, the green power supply light on . Press...
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