I have a COMPAQ SR1350NX desktop. I shut it down to move the unit from a table to my desk. Will not power up. LED light on PSU blinks. Can hear clicking noise from PSU. Followed HP help and have disconnected everything from PSU and LED is on steady. When I plug in 24 pin to MB, LED blinks. Also noticed green blinking LED on network connector. Disconnected everything from MB and still blinks when 24 pin plugged in. Has MB somehow gone bad?
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Try a Power Supply Unit (PSU) Reset: Unplug the electrical cable from the wall and the PSU (Back of Computer)
Move the red voltage selector to the opposite position it is in and then slide it back. If you live in the USA 120Vac to 220Vac back to 120Vac
After you have done this you can plug the power cable back into the PSU. Connect the power cable to the wall power. If the PSU is still serviceable it will no longer be blinking.
May be the PSU. This PC has a few miles on it ,right? I had a HP/Compaq SR1120nx when the PSU when out it would try to start and immediately shut down. Over and over. A PSU is not that expensive. Be sure to get the same type ATX connectors. Verify it is a ATX. Mine was 400w for under $50.00. I uped the power from 250w to 400w, I had added Graphic card, sound card, wi-fi card.
it sounds like you may have overloaded the PSU, best thing to try would be to take out the dvd burner and and try booting again, if this doesn;t have any affect it may mean you need a new psu (power supply).
Try a few things for me OK? From what you typed, turned on the psu "the toggle switch on the psu", pc seemed to be starting up. I need you to keep the toggle switch on the power supply in the on position. Press and hold the start button on the PC case to shut it down. Give it a few seconds & power up by pressing the power switch on the case. Notice a differance? Next, unplug everything connected to the pc expect the monitor, mouse & keyboard. Try to boot. Still no? Remove the side of the case exposing the board. Turn the psu off by flipping the toggle switch on the psu, wait till the green light on the board goes out. Grab the Mb ( I know it's tight in there) and see if you can move the board in any direction. Not loose? Re-check all data & power connections for a solid connect. Re-check your case to Mb connections. Also check the PSU, there is a red slide switch it should be set to 115v. Post your findings..