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How many blinks? Count and notice the patterns of the blinks (3 long blinks or 1 long blink followed by two short blinks).
Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.If all the above fails, you problem could be your Video Card or a motherboard issue.
Power led on the front of the tower, it should be solid green when on. Flashing Amber is generally an indication of a bad power supply inside the tower
Power LED Solid AMBER indicates system is not finishing the power on self test (POST) and you remove all connections from the tower except power and try turning on again. If no change, remove all PCI and PCI-E cards from system, try again, no change replace motherboard.
On the back of the tower are 4 diagnostic LEDs near the ps2 ports marked ABCD, after the POST, during a normal boot the will flash in several sequences and with boot is finished all 4 should be green. If they stop an a different pattern, then that indicates a failure Yellow Yellow Green Green indicate bad RAM for example
If the LEDs on front and back are Green then the system appears to be booting but the monitor display is not functional
A solid amber power LED on a Dell System is indicative of a no post. There are 4 diagnostics LEDs on most Dell Towers (Either on the back marked ABCD, or on the front marked 1234) they can give more details of what the POST problem is.
Troubleshooting: Disconnect all external connections to tower except power, turn it on, see if the LED indications changed. If they change, then connect disconnected items one at a time till the failed item is found. If no change, the open tower, remove all PCI expansion cards, see if system will boot. If still no change, then most likely a motherboard failure. Take RAM out, see if you get a Beep error code when powered on, if no beeps, replace motherboard. If it does beep, try RAM modules one at a time, if it boots with 1 but not the other, replace the effected module. If no boot, with either replace MB
1.Remove All External Devices 2.Check the Computer's Power LED 3.If the power LED has not changed unplug the Power Cable From the ComputerDisconnect All Hard Drive Power and Data Cables and power on the computer. If still no go. 4.Remove All PCI, PCI-E, and AGP Expansion Cards . 5.Remove All Memory From the Computer 6.Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires. 7.If still no go. 8.Disconnect the Power Connection to the Chassis Fan 9.If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234. Rate if useful.
Please consult this Dell link for general startup troubleshooting for your system., and this link will take you to the codes for the error lights and beeps. Finally, here's a good article to help solve general startup problems and diagnose the possible cause.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!
Try to check connections between the monitor and the System Unit or what they called CPU. Turn on the computer you must hear 1 beep means the computer start normally. if you haven't, try taking out any new installed hardware but not the video card if you don't have onboard video device and turn on your computer again.. if problem still exist keep in touch.. TY