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My name is Pradeep and I work for Dell's Social Media Team.
Please turn off the system and unplug only the power cable. Press and hold the power button for 15 seconds. Plug in the power cable and turn on the system. Let us know if the system is booting to windows.
Please let us know if you can hear fan noise from the tower.
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It's getting power, it's just not getting signal from the data cable. The cord that connects to the monitor, (not the power) is typically the reason it is going into standby mode. This can also happen if your graphics card driver is missing on your operating system, but you said you tried the monitor on another machine, so I narrowing it down to most likely be the data cable. Try another cable.
Constant beeping when you turn a computer on is an indication that you have a RAM memory error. To confirm this, open the tower (after unplugging the unit and pressing and holding the power button in for 10 seconds to confirm there's no charge left). Locate the sticks of RAM memory and remove 1. Then plug the unit back in and reboot. In most cases, the beeping will go away and the machine will boot up. This doesn't usually mean you have a bad RAM memory module, just a bad "bank" on the motherboard. If you like the machine, and removing the RAM works for you, you can either run minus the stick of RAM (the machine will be slower) or do a motherboard upgrade. You can usually get a good motherboard + CPU upgrade in the $90 range. Choose a motherboard that will accommodate the existing RAM memory to keep the project cost effective.
If you have the machine plugged in and you push the on/off switch and nothing happens (no sound, no lights, no action) then most likely your power supply has died. Good news is that it's easily replaced and is not very expensive. Now if you mean that it turns on and THEN nothing happens, you have a much more complicated problem. Let us know.
Since you are looking inside, try this. Trace the wires that come from the power switch back to the Motherboard. The wires from the switch will connect to two pins on the motherboard. Carefully jump those two pins with a screwdriver and the machine should turn on. I would suggest doing this with all drives and cards unplugged first.
you can try this solution
unplug all cables , powerflee the system by pressing the start button for 30 sec , release it then replugg all the cables and check wheather it is working or not , secondly check wheather the powers supply fan on the back of tower is working or not, still it doesnt work turn off the tower and unplugg the tower and then openthe tower , check all cables and reset the RAM on the mother board ...you can try this basic troubleshooting , it will help u... waiting for response