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I replaced the video card and it still will not boot up.

\015 I have a Dell Dimensions PC and the video seemed not to work. I replaced the video card and it still will not boot up. I did notice that on the back there are 4 LED's and the A and B lights are yellow.\015

Answers :

IF A&B are yellow and C&D are green it indicates a memory error.
\015\012
\015\012If A&B are yellow and C&D are off then it indicates that the computer is in sleep or reduced power mode.
\015\012
\015\012What was your symptoms before you replaced the video card? Sometimes if the power supply is weak or bad or you have a bad motherboard then you get no video output. Check your cpacitors on your mobo for leaking or swelling. Let us know what you find out.
It's not the video that has a problem...
\015\012\015\0121. STEP:\015\012Ensure Correct Power Button Is Used and Is Not Sticking or Broken. If the\015\012power button remains depressed during the power-on attempt, the computer\015\012immediately powers off, mimicking a "no power" symptom. Ensure the\015\012button is not being held down too long or binding against the bezel or chassis.\015\012If necessary, remove the front cover to press the button directly.
\015\012\015\0122. or\015\012else...STEP:\015\012Check the Power Button LED on the Front of the Computer (on Blinking yellow)
\015\012Initial state of LED at power up.
\015\012Indicates system has power, but the POWER_GOOD signal is not yet active.
\015\012If the hard drive LED is off, it is probable that the power supply needs\015\012to be replaced.
\015\012If the hard drive LED is on, it is probable that an onboard regulator or\015\012VRM has failed. Look at the diagnostic LEDs for further information. or lese..

\015\012\015\0123. STEP:\015\012Restart the Computer Using the Power Button.Press and hold the power button\015\012down until the computer powers off. This should not require more than 10 - 15\015\012seconds.Press the power button to turn on the computer.
\015\012\015\0124. STEP:\015\012Verify the Power Supply Voltage Selector Is Correct for the Region. Verify\015\012the setting for the power supply:
\015\012\015\012*Unplug the power cable from the back of\015\012the system. *Press and hold the power button for at least 5 seconds to\015\012discharge remaining power.*Inspect the voltage selector setting on the back of\015\012the machine (Figure 1). Ensure that the voltage select is set in\015\012the correct position for the region the in which the system is operating: For\015\012Europe and Asia, the voltage setting should be 230V.In North America,\015\012Mexico, parts of Central and South America, and parts of the Caribbean, the\015\012voltage setting should be 115V.*Plug the power cord back into the back\015\012of the system.*Turn on the power.
\015\012\015\012STEP:\015\012Try a Different Known-Good Wall Outlet.
\015\012\015\012STEP: Remove All External Devices. Turn the system\015\012off.
\015\012\015\012Unplug everything from the front and\015\012back of the system except for the power cord or AC adapter, including: keyboard\015\012mouse monitor speakers printers scanners USB devices handheld PDAs external Zip\015\012or CD-R drives joysticks/game pads, etc
\015\012\015\012Attempt to turn the system on.
\015\012\015\012STEP:\015\012Check the Power Button LED on the Front of the Computer
\015\012\015\012
\015\012\015\012Blinking Amber/yellow: Initial state of\015\012LED at power up.
\015\012Indicates system has power, but the POWER_GOOD signal is not yet active.
\015\012If the hard drive LED is off, it is probable that the power supply needs\015\012to be replaced.
\015\012If the hard drive LED is on, it is probable that an onboard regulator or\015\012VRM has failed.

\015\012\015\012
\015\012\015\012
\015\012\015\012Check\015\012the network adapter if it is working. \015\012Then if the device is not working proper
\015\012\015\012
\015\012\015\012
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