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If the power light is steady amber - The computer is receiving electrical power, but an internal power problem might exist. Ensure that the microprocessor power cable is securely connected to the system board. it might also be a failed mainboard already since you are experiencing a blackout.
The only thing you can do about this is try to make sure it is clean and nothing is preventing it from spinning. Make sure it is not seizing up. GX270 is pretty old pc so it might be just fan it self going bad. I had a dell pc that was about as old as GX270's and my fan fell off the motherboard while spinning. Hope this helps.
Check the cpu fan and fins are clean if you have to take processor out make sure you reapply thermal compound, Also check the ram is seated correctly.Also check the psu is functioning correctly as it could be a faulty psu . Good luck John
You may have a failed motherboard or bad/weak poswer supply unit (PSU) then. Failure of motherboards is usually due to breaking capacitors. A few years ago a capacitor company stole the "recipe" for making capacitors from another company and tried to make their own, unfortunately they did not get the ingredients right and the capacitors started breaking after 2-3 years of use. They sold these capacitors at very cheap prices and a lot of computer companies and power supply makers bought them. The DELL GX270 and GX 280 were the main DELL models affected by this situation. This is easy to diagnose. Look for capacitors (caps) (they look like little tiny soda cans) on your motherboard (mobo). They should be perfectly flat on top and not bulged or swelling or leaking anything. Make sure you look under the fan shroud. Most of the bad ones had either a plus + or X on the top - depending on your interpretation. There are a few companies that will repair broken capacitor issues. If it has recently gone out of warranty you could try to contact DELL to see if they will ship you another one. I was able to get them to fix a couple of mobos out of warranty, but that was two years ago. To eliminate some other stuff you could remove the memory and disconnect all the power plugs from the drives and then try to start it up. If it does not change the behavior at all (no beeps, no change in flashing lights) then you probably have motherboard or power supply issues. Make sure when disconnecting the memory chips (sticks) that you touch the metal on the inside of the case first to discharge static electricity. If it does change the behavior add 1 component or item back at a time to see what you can find out. Post back with what you find. And remember a bad PSU does not mean no power, just not enough to run the computer. If you change out the PSU, the one that you replace has to have the same or greater output watts?
It is either dust build up on the CPU heatsink under the fan or that model is known for blown capacitors...
Open case and check motherboard for blown capicitors and / or dust build up on CPU heatsink
And if there are any bad capacitors then you will need to replace the motherboard.