Please refer to this link to explain the diagnostic lights on your pc.
http://support.dell.com/support/systemsinfo/document.aspx?s=biz&~file=/systems/ws380/en/ug/a04/diaglght.htm#wp1055897
SOURCE: dell 4600c will not power up -- green power button lit -
i think it may not power supply problem.it may be ram memory problem.try this,remove your ram and clean it with cloth and restore back.
SOURCE: Dell dimension 5150 Diagnostic Lights 31 BLINKING 3,4 SOLID
Hi you've either got the wires on the wrong connectors or they need to be turned around, i.e. red needs to be where black is. Hope this helps
SOURCE: computer will not boot
http://support.dell.com/support/topics/global.aspx/support/dsn/en/tree?journalid=6EB139500365CBA6E040AE0AB5E109D6&treeid=286725
See that link for the beginning of the Dell troubleshooting wizard for diag lights 3 & 4, it is in fact a memory subsystem error. Usually meaning the stick of memory in the first slot is bad. The wizard will walk you through this, but try removing the first stick and using the second stick in the first bay and see if it will boot. Unfortunately no recalls on RAM for this model but the good news is that your memory is cheap and if your not under your service contract you can buy a set on newegg or a similar site for about 50 bucks.
SOURCE: Dell Precision 380 won't boot
I had a similar situation with a work computer; the power supply always tested good. A wiser and more experienced computer guru ordered a new power supply. He gave it to me told me to install it, I did and was laughing the whole time. Well it in fact was the power supply. Reason, power supplies are funny like that, they may test good under ideal conditions which is a minimum load put on the unit (enough to boot your system). They are not tested with the stresses of maintaining all your fans, hard drives, mother board, video card, monitor, CD drives, mouse, and keyboard. Its when those loads are applied is when the unit either surges or it is faulty and cannot maintain. First try finding some way to test that suspected bad circuit. If that's not it I would try replacing the power supply, that MAY NOT be your problem but it is certainly CHEAPER than replacing your processor and/or mother board. You could also have a hard drive problem; most drives have self testing features that are partitioned separate from the rest of drive. You can also try plugging your drive into a good computer and see if it boots.
I'll warn you though issues such as yours can take you down a costly road trying to trouble shoot. The components you are thinking of replacing pretty much will give you a brand new computer.
Hope this helps
SOURCE: dell precision 490 led 4 remains on
try to clean the memory slot of your computer as well as the memory module then power up your PC. just do hardware maintenance by means of cleaning all any dust inside the computer. Hope it helps thanks.
When
you plug in the power cord is there any lights whatsoever on the computer?
When you press the power button do you hear fans running, hard drive spinning,
lights on the computer, hear any beeps or lights constantly blinking, hear the
DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a
second or two? If so the laptop is trying to boot or may have booted, but
the screen is not showing for some reason.
Beep tones and blinking lights tells the technicians what is going on with the computer
and why it is not booting. Most times it's a motherboard issue when you
hear beeps or blinking lights continuous. Most times the problem is with
the memory or Video Card. Count the Blinking Lights or Beeps and take note of
their pattern (1 Long or 1 Long followed by 2 Short).
Maybe your power cord is bad if you don't get anything to happen whatsoever
when you press the power button.
Maybe
you have a Static Charge Buildup. Remove the Power Cord, then Press and
Hold the power button for 30 seconds. After 30 seconds plug the power
cord back in and hit the power button to see if it boots.
Maybe
your memory is bad or the memory slot is bad.
Remove
the Power Cord, Open the Case and remove one of the memory 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 on it with an ink pen.
If it fails to boot then move the chip to the next memory slot and try
rebooting. If it fails take the chip out and set it aside, then put the
other chip in and try booting it in both slots. If it boots, just to
verify that the chip set aside is bad, mark an x on it and put it into the open
memory chip slot and try booting.
Maybe
your power supply is bad. Sometimes there is enough power to make the
power light or some other lights come on but not enough power to make the fan
turn on or hard drive spin.
Below are links and info I found from Dell's Website based on your model.
http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/specs.htm
Controls and Lights
Front of computer:
Power button - push button
Power light
green light - Blinking green in sleep state; solid green for power-on state.
amber light - Blinking amber indicates a problem with the power
supply inside the computer. If the system cannot boot and there is a
solid amber light, this indicates a problem with the system board (see
"Power Problems" in your Owner's Manual).
Diagnostic lights
four lights on the front panel (see Diagnostic Lights.)
Standby power light
AUX_PWR_LED on the system board
Hard-drive activity light
green light - When the computer is reading data from or writing data to the hard drive.
LAN indicator light
green light - Solid green indicates that a LAN (local area network) connection is established.
http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/adtshoot.htm#wp1056411
Suggested Resolution
Solid green
Power is on, and the computer is
operating normally. On the desktop computer, a solid green light
indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
A configuration error exists.
Check the diagnostic lights to see if the specific problem is identified.
Solid yellow
The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.
If the Dell Diagnostics is running, allow the testing to complete.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
Solid green and a beep code during POST
A problem was detected while the BIOS was executing.
See "Beep Codes" for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified.
Solid green power light and no beep code and no video during POST
The monitor or the graphics card may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified. See "Video and Monitor Problems" in your Owner's Manual.
Solid green power light and no beep code but the computer locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified. If the problem is not identified, contact Dell for technical assistance.
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