Question about Dell Optiplex 755 Desktop Desktop Computer

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System unit led is yellow and start good condiotion but no signal

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The light on the LCD screen stays yellow?

I would start with puling out the ram chips and see if it works,

If you get some beeps and video works with ram chips out, then its a bad ram chip.

If thats not it.. unplug all cards cd/dvd rom and harddrive to test motherboard and CPU chip. see if you can get video to work with everthing but cpu and power suppy unpuged

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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System unit led is yellow and start good condiotion but no signal


HI this could be due to static

do the following

1) unplud all the cables from back of the Tower including the power cables

2) press and hold the power button for 30 seconds

3) put back the cables and check.

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Dell Power Up Problem


No Power, No POST, No Video
1. STEP: Ensure Correct Power Button Is Used and Is Not Sticking or Broken. If the power button remains depressed during the power-on attempt, the computer immediately powers off, mimicking a "no power" symptom. Ensure the button is not being held down too long or binding against the bezel or chassis. If necessary, remove the front cover to press the button directly.
2. or else...STEP: Check the Power Button LED on the Front of the Computer (on Blinking yellow)
Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic LEDs for further information. or lese..

3. STEP: Restart the Computer Using the Power Button.Press and hold the power button down until the computer powers off. This should not require more than 10 - 15 seconds.Press the power button to turn on the computer.
4. STEP: Verify the Power Supply Voltage Selector Is Correct for the Region. Verify the setting for the power supply:
*Unplug the power cable from the back of the system. *Press and hold the power button for at least 5 seconds to discharge remaining power.*Inspect the voltage selector setting on the back of the machine (Figure 1). Ensure that the voltage select is set in the correct position for the region the in which the system is operating: For Europe and Asia, the voltage setting should be 230V.In North America, Mexico, parts of Central and South America, and parts of the Caribbean, the voltage setting should be 115V.*Plug the power cord back into the back of the system.*Turn on the power.
STEP: Try a Different Known-Good Wall Outlet.
STEP: Remove All External Devices. Turn the system off.
Unplug everything from the front and back of the system except for the power cord or AC adapter, including: keyboard mouse monitor speakers printers scanners USB devices handheld PDAs external Zip or CD-R drives joysticks/game pads, etc
Attempt to turn the system on.
STEP: Check the Power Button LED on the Front of the Computer

Blinking Amber/yellow: Initial state of LED at power up.
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the hard drive LED is off, it is probable that the power supply needs to be replaced.
If the hard drive LED is on, it is probable that an onboard regulator or VRM has failed.

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Samsung aircon cuts off. lights green/yellow flashing


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System will not start up.


This is a signal fault between the indoor and outdoor first make sure the dip switches are set start with the unit closest to the condensor set as unit 1 then next unit as 2 and so on the dip switches are inside the indoor unit on the pc board if you check the manual it will tell you which swithes to set, if this wasnt done when the units where installed they would have never worked i would also check the signal wiring between the wallmount and the splitter box / bc box and make sure there isnt a loose connection when you have ruled this out id say more than likely it is a faulty indoor board on the wallmounted unt

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LRD6399SWS


LED Display gives you your display visual alerts, signal strength, and operation mode. Here is an attached link for the manual.....http://www.uniden.com/pdf/LRD6399SWSom.pdf
But to answer your question here is what the difference between the green light and the red light are:
1. X-Band Signal Indicator—A green LED lights and blinks to
indicate the presence of an X-band radar signal. The blink rate
increases as the radar source gets closer. A distinct audio alert is
also heard.
2. K-Band Indicator— An amber (orange) LED lights and blinks to
indicate the presence of a K-band radar. The blink rate increases as
the radar source gets closer. A distinct audio alert is also heard.
3. Ka-SuperWideband Signal Indicator— A yellow LED lights and
blinks to indicate the presence of a Ka-SuperWideband radar
signal. The blink rate increases as the radar source gets closer. A
distinct audio alert is also heard.
4. Laser Signal Indicator— A red LED under L lights and blinks to
indicate the presence of a laser signal. A distinct audio alert is also
heard.
5. SWS Signal Indicator— When an early warning hazard or
informational signal is detected, the yellow SWS LED begins to
blink and the amber K-band LED lights. A distinct audio alert is
also heard.
6. Power-On Indicator— A green LED under P lights to indicate
power is being supplied to the unit and the unit is turned on.
7. LED Signal Strength Meter—Four LEDs give an accurate visual
indication of the strength of radar or laser signals.
8. City Mode Indicator—A green LED under C lights to indicate
that you selected City Mode.
9. Auto Mute Indicator— A red LED under M lights to indicate that
you selected the Auto Mute feature.

Please make sure you give me a rating and I hope this helps,
cbinny1



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2 Answers

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Make sure your monitor is plugged in and try again

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1 Answer

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your english is not bad to to start with!
and the possible solution to your problem is just ask the administrator to help you out,dont try to do it yourself cause sometimes problem gets worsen!

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Neovo x17a monitor


Are the settings on the video output correct? Is there a green or orange light illuminated. There is a difference between the Power LED and the Signal LED which is green. If you have no signal the LED will remain orange or yellow but not green. If the LED is green, then a signal is getting from the PC but not necessarily good. Check the signal with another monitor or TV if you can. Check the cable.

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