Question about Dell OptiPlex GX620 PC Desktop

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When in the setup section looking into pc setting cooling fan goes on to high speed then pc shuts down, then when I reboot and the screen comes up tells me that there was a thermal shutdown and ask me to press f1 to continue or f2 for setup I just got this used unit and I am still just checking it out it has the a11 bios and I see no heavy windows use when the pc has booted meaning using task manager. Dell OptiPlex GX620 PC Desktop Service Tag: CPSQV81 System Type: OptiPlex GX620 Ship Date: 11/17/2005 Dell IBU: Americas Quantity Parts # Part Description 1 W8400 Processor, 80547, Pentium 4 Prescott Dt, 630, SKT-T, Male 1 Y9628 INSTRUCTION..., DEVIATE-TO-MCSF-L5.5 0 149DF INFORMATION..., PREPARATION MATERIAL..., DEVIATION..., PRECISION WORKSTATION..., INCREASE..., #2 1 5120P Cord, Power, 125V, 6Feet, SJT..., Unshielded 1 C8649 KIT..., Mouse, UNIVERSAL SERIAL BUS..., 2 Button, Lead Free, Optical, Primax Electronics Ltd 1 N6250 Keyboard, 104, United States Universal Serial Bus Multi-media, Liteon 2 F6761 Dual In-Line Memory Module, 512533M, 64X64, 8, 240, 1RX8 1 U9565 Assembly, COMPACT DISK READ WRITE/DIGITAL VIDEO DISK DRIVE COMBO..., 48X Half Height, Toshiba Samsung Storage Technology, CHASSIS 2005... 1 DC164 Kit, Documentation on Floppy Disk, Software, PowerDVD, 5.5 RLOB 1 T6116 Display, Flat Panel Display, 19 Dual Voltage, 1905FP, Midnight Gray, DELL AMERICAS ORGANIZATION... 1 H9142 Card, Graphics, 128, X600 OUGA3, Full Height 1 XD673 HardDrive, 80GB, S2, 7.2K, 8M, Lead Free, Samsung 1 DD131 Assembly, Floppy Drive, 1.44M SONY, CHASSIS 2005..., Lead Free 1 WD766 Kit, Software, Overpack, WXPPSP2BCDWD, English 1 J8181 INSTRUCTION..., DEVIATE-TO-MND-L5.5 1 J7109 Assembly, Heatsink, Shroud Mainstream, Matrix, Smith, Mini Tower 1 Y8343 ASSEMBLY..., CHASSIS..., MATRIX,SMITH,MINI TOWER..., OPTIPLEX..., GX620, PWA INTEGRATED... 1 J8182 INSTRUCTION..., DEVIATE-TO-MSMT-L5.5 1 D9899 Assembly, Speaker, 1W, 28MM 12CBL, Lead Free 1 TC935 Kit, Compact Diskette, Driver Resource Compact Disk Optiplex, V2 1 J8461 Assembly, Cable, Video, Lead Free 0 83535 INFORMATION..., PART, ADVANCED TECHNOLOGY ATTACHMENT PACKET INTERFACE..., DEVICE 1 T4860 Guide, Product, Information Desktop, AMF/BCC

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  • info20383 Sep 13, 2009

    ok how do I "reset your motherbord settings to factory defaults"

  • info20383 Sep 13, 2009

    Hey thanks I was doing that while I was waiting for a reply here is what I found....

    It was a recond pc well the tech who worked on the unit had left one screw lose and 1 not even tight on the other side so the heat sink was not in full contact thus creating an overheat condition so I will except your reply just because your replies were correct if that was what I would have needed but have a great day ....

  • info20383 Sep 13, 2009

    This tech was right on target the reason I had come to you was because of all the write ups I found online for gx620 overheating and your tech steered me in the correct procedures so thanks....



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It is becaseu of heating event on motherbord for that First reset your motherbord settings to factory defaults.
Remove dust from all circuit of motherbord.
Reconnect RAM memory.
If still face issue then you have to need put extra fan in cpu and change heat sink fan upon processor.

Let me know if you need more assistanse.

Posted on Sep 13, 2009

  • For RESET motherbord settings to defaults pull CMOS cell from motherbord for 10 minutes so all settings are defaults.
    CMOS cell is round cell.
    Let me know if you need more assistanse.



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I have a 2006 buick lucerne 3.8 v6 coolinf fans dont come on .i need to know how to change the relay and the fuse.

Your vehicle cooling fan's are controlled by three relay's , couple of fuse's an the PCM - engine computer . The engine coolant temp. sensor is a input to the PCM , when engine temp get's to 212 the PCM will turn on the cooling fans in low speed . Checking to see what the actual temp is with a scan tool an a infrared thermometer at the thermostat housing ,an looking up the specification's in a service repair manual is how to diagnose . Not guessing an replacing parts . Plus learning how the cooling fan's work .
Relay Driven Dual Cooling Fan Diagnostics Reading factory service info as to how they work also would be a good idea .

Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 puller type electrical cooling fans and 3 fan relays. The relays are arranged in a series parallel (S/P) configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block. The ground path is provided at G104.
During low speed operation, the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan S/P relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the ECM supplies a ground path for the high speed fan relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan S/P relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time, the high speed fan relay coil is energized closing the relay contacts, and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit, to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The ECM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 94.5°C (202°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF, if the engine coolant temperature at key-off is greater than 101°C (214°F), the low speed fans will run for a minimum of 60 seconds. After 60 seconds, if the coolant temperature drops below 101°C (214°F), the fans will shut OFF. The fans will automatically shut OFF after 3 minutes, regardless of coolant temperature.
The ECM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed, if required. This ensures idle stability by preventing the fans from cycling between high and low speed.

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1 Answer

Computer shuts down

Make sure Windows Update is turned on. For Windows 7, Vista, and Windows 8 there are Updates that resolve some hardware glitches such as the one you are experiencing.

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1 Answer

My E520 Dell shuts down in to the energy save mode after 1 minute of booting and then the high speed fan comes on and screen goes black

off the energy save goes revert of ur opreating it work? clearfy

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This is a Unico AIR HANDLER in a residential application with heat / cool unit in the attic. With system off (not calling for cool) and fan in auto mode, the blower fan is on high speed only constantly....

Sounds like a sticking relay. You can check the stat simply by remove the faceplate. If fan still runs with tstat cover off its not the stat. Not sure is your blower has a separate relay or if relay is mounted on control board. This can be bypassed with a new relay if you are willing. Good luck!!

If you need further help, reach me via phone at

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The ThinkPad 2647 8MU will not restart. After a screen that shows IBM Thinkpad, then a black screen comes up that says: Error Fan Error Press <F1> to Setup. If I press <F1> it...

Your system fan has died and need to be replaced. You can look in your bios for a setting to ignore fan speeds, you may or may not have one depending on your bios. But be careful, if you can bypass the fan error, you risk causing harm to your computer by overheating the processer.

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You could have a faulty fan and/or dust clogging the fan and heat-sink assemble. This is the most likely cause of the laptop shutting down. When the CPU overheats it goes into thermal shutdown and if this problem is not fixed, eventually the CPU will fail.
Check the fan to see it it spins freely and check if the fan works when the laptop is powered up.
If the fan and heat-sink is ok, then to give the laptop addition cooling then purchase a laptop cooling pad and place the laptop in this pad (These pads have cooling fans and helps cool the laptop).

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1 Answer

Variable speed fans suddenly slow single speed only.

check with the temperature of the CPU core!
because of over heating the CPU is shutting down or not.

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I am not an expert on Mazda vehicles but sounds like your fan temperature sensor is not working properly. My fan comes on low speed when the temp hits 205 and goes to high speed at 220 or when the air conditioning is on. You had better get it checked by your dealer or service tech.

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My DC5000 SFF turns on okay then switches off randomly Help!!

Which fan are you referring to? As far as I know the fan in the power supply runs at the same speed at all times. So if that is the fan you are hearing it may indicate that the power supply is failing. The power supply may be over heating and shutting down. I would try a different power supply if you can get your hands on one.

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1 Answer

Computer STartup Problem

That is an impressive wait. You must be an OR LP to have tolerated that battery manipulation; hopefully the surgeons aren't up nights over the 3 lost insulated forceps.... It sounds as though the system is dissatisfied with the CPU fan speed or another power/cooling interface component (CPU over 90 centigrade, chipset over 95 centigrade, the power supply fan running, etc.) and thus shutting down immediately to protect itself. Do all those things check out, particularly in the BIOS power/cooling section? How about fan and power connections on your videocard being right and jumpered accommodatingly?

That is, you could connect tach fans on any spare 3-4 pin headers and see if favor comes your way. The system will spin them slowly once it boots and you enable automatic CPU/fan control (and power savings) settings.

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