Check your connection from PC to Monitor if the monitor is on standby the led should be on. Try a another monitor to check that the graphics on the pc are still working this will determine if it is a problem with Monitor or graphics card.
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I have the same problem. As I see, here is dead sub PCB with microcontroller on board. Small PCB with 26 pins, mounted verticaly on main, big power supply board. It is not available as a spare part. You must buy complete power supply board LJ44-001444A, as I have done.
Even though a lot of things might have gone wrong and caused this, especially if where you place the System is not well ventilated, and the CPU becomes very hot, it shuts down automatically...and you will have to wait for a few moments, get a cool environment and power it on. but I will also try and tell you some troubleshooting steps that you can try.
Since you have already checked the power source and all is Ok, then try this out:
Disconnect your PowerPack(Power Supply Unit) from the CPU and try to power your PC with another Power Pack (Power Supply Unit), that you are very sure is working.
If it powers up, then just get a new Power Pack(Power Supply Unit) for system.
If you cant do this yourself, just get a good technician to do it for you.
Try this first and let me know how it goes, so as to know the next step.
I would think the batteries need replacing. That happened to my Dell Latitude CPI. The batteries won't charge past about 3%, so I got new ones and that did the trick. If this is under a year old I would contact Dell about it, if it is under a year old they should replace the batteries.
IT CAN BE MANY THINGS 1 UNPLUG SYSTEM FROM THE WALL, 2 REMOVE THE MEMORY AND REINSTALL THEM, 2
CHECK ALL CONNECTION INSIDE THE COMPUTER CASE AND THE OUTSIDE TO, 3 TO REMOVE A POWER SUPPLY IS 4 PHILLIPS SCREWS POWER CONNECTIONINSIDE CASE, REMOVE THE POWER FROM ALL OTHER DEVICE CAREFULLY AND TAKE IT TO YOUR NEARST COMPUTER STORE, SAVE YOUR RECIEPTS IN CASE IT IS NOT THE POWER SUPPLY PROBLEM, RETURN IT AND GET YOUR MONEY BACK.
POWER SUPPLYS SHOULD NOT COST MUCH, IFYOU ARE STRAPED FOR MONEY GO TO GOOD WILL AND HAVE THE FIRE UP ONE OF THE SYSTEM THEY HAVE THEY MAY EVEN HAVE A NEW ENPTY TOWER CASE LAYING AROUND FOR 30.00 DOLLARS.
Best way to check is to open your case. Near the power supply plug to the motherboard should be a little led light. If it is getting power to the board this light should be green. If it's unlit then most likely your power supply has gone bad. Hope this helps.
When I first started repairing things a mentor said always unplug anything you are working on. I found this to be a number one rule. You just don't know what still has power even though it says it's off. I've made this mistake too by not checking.
Hopefully the power supply is just shutting down due to a drain on it's voltage and will be okay. Take out whatever you tried to install. Try it again. Take out anything not necessary to boot your computer. You'll need the video card if not integrated. If you have a bootable floppy, Unplug the hard drive. See if you get to a screen where you can go into the bios setup mode. You also might want to write down where things go back. This is especially if doing this with little sleep. Let me know..'ask me.'