Question about Dell Latitude C400 Notebook

2 Answers

Can not start

After I press POWER button, its power LED is lighten.
but just a few (1 to 2) seconds then the whole laptop is off.

where is the problem?

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2 Answers

I've had the same tproblem. After you depress the power button, try pressing F3

Posted on Aug 03, 2008

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This could be a problem with the battery or the memory. First try starting without the battery. If this isn't the problem, then try taking out the memory, putting one in and starting, take this one out and then try the other. The memory is located, one chip under a panel on the bottom, the other under the keyboard. Remove the plastic strip with the power button to get to the keyboard screws. Keep in mind that a Dell machine will not start without any memory. If it still won't start, then I'm afraid the problem may lie with the motherboard, and will need a professional diagnostic.

Posted on Jul 15, 2008

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Posted on Jan 02, 2017

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1. Verify AC power presence with MagSafe LED indicating on or charge state.
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3. Reset SMC
Resetting the System Management Controller (SMC) The System Management Controller (SMC) is a chip on the logic board that controls all power functions. If the computer is experiencing any power issue, such as not starting up, not displaying video, sleep issues, or fan noise issues, resetting SMC may resolve it. To reset SMC: 1. If computer is on, turn it off by choosing Shut Down from the Apple menu. 2. Connect power adapter to computer and to a working power source. 3. On built-in keyboard, press (left-side) Shift-Control-Option along with power button just once. Important: Use Shift-Control-Option keys on left side of keyboard. Note: When the LED on the MagSafe connector is orange/amber, resetting the SMC will change it to green for a few seconds, indicating that SMC was correctly reset. 4. Wait 5 seconds and press power button to start computer. Note: If bottom case is removed, you can alternately reset SMC by disconnecting both power adapter and main battery, and holding down power button for 5 seconds.

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Hi, try this step:

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Hi,

1. Turn off computer and unplug power cord.
2. Disconnect all external devices(open up the computer tower and then )
3. remove battery
4. press power button and hold for 10-15 seconds
5. plug power cord back into computer and press power button.
6. Check LED’s and listen for power supply fan.
7. If LED’s are on or power supply fan starts spinning, watch for boot screen
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This flashing LED means only one thing, and it is quite harmless:

Your laptop is either "asleep" (suspended) or in "hibernation" mode.It does this if left for a long time with no activity/input from you. You must simply "wake the laptop up" now:

Look for a symbol on keyboard for "sleeping" (like a half moon with zzzz) and press that key WITH whatever color coded key matches the symbol color (usually "FN" key). If there is no suchkey, press the space bar and hold it down a few seconds.

Then wait. Can take 60 seconds to "wake up" on slower processors.

If this does not work, press AND hold the POWER button for 10 seconds. Then wait 60 seconds and press power key again, briefly, to start laptop normally.

Pressing and holding the power button 6-10 seconds forces a complete system shutdown.

If this happens often, something may be wrong with APM or ACPI settings/driver. You can go to start menu/settings/control panels/power management and adjust settings (or disable sleep/suspend and hibernation if all else fails to resolve situation)

good luck.

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Toshiba power led flashing yellow


This flashing LED usually means only two things, both are quite harmless:

1. Some laptops will flash the power LED when battery is charging. If this is the case, it should stop when battery is fully charged. This can be presumed if the laptop starts normally while LED flashes. If not, suspect step 2 below:

2. Your laptop is either "asleep" (suspended) or in "hibernation" mode.It does this if left for a long time with no activity/input from you. You must simply "wake the laptop up" now:

Look for a symbol on keyboard for "sleeping" (like a half moon with zzzz) and press that key WITH whatever color coded key matches the symbol color (usually "FN" key). If there is no suchkey, press the space bar and hold it down a few seconds.

Then wait. Can take 60 seconds to "wake up" on slower processors.

If this does not work, press AND hold the POWER button for 10 seconds. Then wait 60 seconds and press power key again, briefly, to start laptop normally.

Pressing and holding the power button 6-10 seconds forces a complete system shutdown.

If this happens often, something may be wrong with APM or ACPI settings/driver. You can go to start menu/settings/control panels/power management and adjust settings (or disable sleep/suspend and hibernation if all else fails to resolve situation)

good luck.

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1 Answer

Free Pulse


The following procedure will re-establish the communication link between the Headphones and the Wireless adapter, this is called "pairing". Before you start please make sure both the headphones and the wireless adapter are fully charged and turned off.
Note: The headphones and the wireless adapter come pre-paired from the factory.
1. Press and hold the power button on the headphones. See Figure 1.
headphone.jpg
Figure 1

2. Continue to hold the button down until the LED starts flashing red/blue in an alternating pattern. Release the button when the LED starts flashing red/blue. See Figure 2.
headphone-flash.gif
Figure 2
3. Once the headphones LED is flashing red/blue, press and hold the power button on the wireless adapter. See Figure 3.
receiver.jpg
Figure 3
4. Hold down the button until the LED starts flashing red/blue in an alternating patter. The LED will blink blue, then turn off for a few seconds then blink red/blue. Release the button when the LED starts flashing red/blue. See Figure 4.
receiver-flash.gif
Figure 4
5. Once both the headphones LED and the adapter LED is blinking red/blue, press the volume up button once on the headphones. See Figure 5.
headphone-volumeup.jpg
Figure 5
Once the headphones is paired with the adapter, the LED on the headphones will blink blue once every two seconds. See Figure 6.
headphone-flash2.gif
Figure 6
When the adapter is paired the LED will be solid blue. See Figure 7.
receiversolid.jpg
Figure 7
The adapter may continue to blink red/blue for a few seconds even after the headphones LED starting blinking blue. This is normal; the adapter may take a few additional seconds before the LED turn solid blue.
Once the headphones and the adapter are paired, it is not necessary to pair them again even if the batteries on both units are completely drained.
Additional Note: Repeated pairing will not improve the sound quality or give the headphones and the adapter a cleaner connection.

Mar 11, 2008 | Logitech FreePulse Wireless Consumer...

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