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Do you use a surge protector? If you do, try turning off the power supply to the surge protector and switch on again. There are a number of causes for this problem, the most likely being a PSU problem or a motherboard fault/failure. To check the power from the PSU to the motherboard, you will need a multimeter to make sure enough power is going to the motherboard. Also check the motherboard closely to see if there is any signs of corrosion or blackened areas, which could be caused by overheating components. Check for leaky or burnt capacitors.
Hi, to find out if the “Keyboard is compatible with your system?” You can do the following: Shutdown the Computer, connect the Keyboard to your computer.Turn on the computer.If, the “Keyboard have a Power Button?”(Turn on) the keyboard.Go to, Control Panel; click on Device Manager.Click to open Keyboards, in the (Keyboard Properties) Click on Driver (Box), next click to Update Drivers! Click OK. Restart the computer.Check keyboards’ functionality. Thanks paul7of9
This info is not enough to give you a specific solution. Try this: Press and hold on/off button for 3 seconds. Turn on button, press f8 continuosly to os start menu, choose safe mode, check sleep and hibernation settings, test for malware/spyware, check startups - run msconfig, disable all startups if needed.
A flashing yellow power LED is an indication of a failure in the power supply. If under warranty, Dell should be replacing it. If out of warranty, then a 400/450 Watt ATX power supply should resolve the issue.