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1) Switch the system on. Can you tell me if the power button is flashing amber or a solid amber? Please also tell me if you notice any diagnostics LEDs staying lit - these are labelled 1,2,3 and 4 and are near the front headphone sockets 2) Please remove all peripherals at the back of the system and switch the system on. Does this affect the power button LED or diagnostic LEDs 3) Have you added any components to the system e.g. video cards, sound cards etc... 4) Please open the system and remove the following components: a) Power and data cables from hard drives and optical drivesb) Any PCI/PCI-Express expansion cardsc) All memory from the systemd) The system fan 5) With the above removed, please reconnect the power cord to the back of the system and switch the system on. Please make a note of what happens with the power button LED and the diagnostic LEDs 6) If there are no changes to the power button LED or diagnostic LEDs, please remove the power cord from the back of the system and remove the following components: a) I/O panel cableb) CMOS battery 7) With the I/O panel cable and CMOS battery removed, please connect the power cord to the back of the system. The system should automatically try to switch on. Do you hear any beeps from the system? If so, can you tell us exactly what you hear?
If you need any assistance with removing these components, please see the User Manual here: http://support.euro.dell.com/support/edocs/systems/op380/en/index.htm
Please keep us updated on how you get on!
If nothing happens when you press the power button then the computer is most likely out of power - plug a charger in and it should work. If it still doesn't you might want to get it checked at a service provider. If something happens when you press the power button but the computer doesn't turn on, then please provide more information, explaining exactly what happens so that I can help you.
Could you describe what exactly you are seeing when you try to turn your computer on? (blank screen, curser blinking in upper rt corner.....) My first instinct would be to insert windows disk (while the computer is on of course) then restart and keep pressing f12 until you get a boot menu. Choose to boot from your optical drive and choose "repair" If this doesn't help, please post a comment letting me know what happened and I will be happy to offer further advise. Cheers...
On the back of the chassis, there are 4 LEDs above the PS2 connections marked ABCD what do they indicate? During the boot process the lights normally flash on and off green, when the boot process is complete, they should all be green GGGG.
If any are Amber then they are indicating a power on self test (POST) failure. AAGG is bad memory for example.
When a power supply goes out the way yours did, it's going to fry the MB 99% of the time. So you're going to need a new MB. It's possible that you CPU is ok, but that could also go too. I would replace the MB first, then the CPU if that doesn't work.