Re: power lights come on for a few seconds then go off
Probably your flourescent backlight has died or its controller board (or both). Hold a flashlight up to the monitor and see if you can see screen content. This will cost you around $150~$200 to fix unless you can do it yourself. Hard job on laptops.
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I assume that you have a video card, and ram plugged in otherwise no startup. If so and you are absolutely certain of good power supply then it could be dead CPU / mobo. Did you buy a new power supply and ensure that the CPU power plug is plugged on the mobo?
You may have a failing motherboard or power supply unit (PSU) then. Just because a mobo has a light on it does not mean that it is getting enough power, just enough to turn that light on. Failure of motherboards and PSU's are 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. 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. There is something in the computer that is not getting enough power and causing it not to start. There are a few companies that will repair broken capacitor issues, if you find that you have that problem. Also if you add a bunch of extra components without upgrading the power supply you can suffer underpowered situations and that can cause internal parts to fail. Have you added any big video cards or extra drives? And remember a bad PSU does not mean no power, just not enough to run the computer. If you replace the PSU make sure that you replace it with one of the same or greater output watts. Output Watts should be listed on the outside of the PSU itself. I would try another PSU first if the mobo caps looked good.
It seems like you have bad MOBO. I recently ordered all the stuff to build 2 new systems. Built the first one, no power, just like yours. Moved everything to the 2nd MOBO, everything worked. I did a RMA on the DOA MOBO. Got the new one and it fired right up. Sometimes you just get bad stuff.
Howdy... I would shed the loads and measure the power supply (pinouts available everywhere on net) what that means is disconnect the drives and I/O cables to them (at the MOBO). Remove any recently added cards or ram . You should be able to see video and/or beeps if voltages are reasonable . A spare power supply would be handy . Slowly add things until failure shows or if MOBO seems at fault ,try your stuff in another PC . There has been rash of swollen/leaking caps 'round these parts due to bad power supplies or bad caps . Bad power supplies can destroy the MOBO . Changing these caps will often resurect a MOBO but this is not for the inexperienced desolderer as these boards are multilayer .
Some eMachines computers (like many from Dell) use a non-standard pin out for their power supplies, so if you try a standard ATX power supply it may not function.
However, in my experience it IS likely to be the motherboard. Luckly I have been able to replace quite a few of the eMachines mobos with a standard mATX mobo, since you can probably remove the IO plate. You'd certainly want to replace the power supply when doing so.
Had the same problem on a few motherboards, check your capacitors very closely. If they are rounded or split on top they are bad. You can change the capacitors with new ones to fix your problem but it often ends up costing as much as buying a new board.