When I push the power button all the green lights come on but after about 3 seconds they shut off and nothing happens. It won't turn on whether plugged in or with a charged battery. I have tried resetting it but that won't work either. What could be causing this?
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The D600 is plagued with power up problems for 2 reasons. First the connector on the motherboard to the power button is very sloppy and after awile it breaks contact. If you put pressure under the docking port area and press the power button it may start. The second is the memory slots. I know you said you replaced the memory, but it is the slot that is a problem. Remove the memory and put 1 chip in "A", then press down on the chip while trying to boot the laptop. If this works then get a peice of foam or pad and place it on the chip. When you put the cover back on it will push down on the chip and should boot. Repeat this process for "B".
The green light does signify a charged battery! This is also a possible reason for not booting. Remove the battery and try to boot with only the power supply. A shorted battery will stop the laptop from starting up.
If all of this does not help then remove the battery and the CD Rom, then try to boot. Finaly if nothing helps you should buy a new Laptop or a used one on E Bay. You could get a used D600 on E Bay that has a good motherboard for cheap money and use your drives and LCD. I work on D600 and D800 all the time. Let me know how you make out!
Unplug your battery and then plug in AC adaptor and see if laptop powers on. I assume you power button doesnt turn on at all? If so, your motherboard seems to have a power issue. Unfortunately, you have to replace motherboard. If laptop. powers on withour battery then you then battery needs replacement.
Disconnect the AC adaptor from the laptop and remove the Battery pack from the Battery bay. Then, remove the RAM module and reinstall it after cleaning the RAM slot. Next, connect the AC adaptor to the laptop then try turning it ON. Please make sure that the AC adaptor is connected to a functional wall outlet. If the laptop still doesn't turn ON then you may try cleaning the Battery bay and the metal contacts in the battery compartment then insert the battery and try turning ON the laptop. If the laptop still doesn't turn ON then the issue is with the power supply unit.
so when you push the button, does the computer turn on and not do anything, or does it turn on, and then off again really quickly. If its the first, then you should try updating you bios to the latest version, if its not already at A16. If its the second, your power switch is probably damaged. You might need to buy a new "switch board" is what it is usually refered to as, and look through the dell d600 service manual on the dell website for how to remove and replace the switchboard. It may take some looking to find it