dell power reset

From this pic, it looks like a 110/220 volt selector switch. Make sure that either:
110 volts is showing on the switch. or
that it is on the 110 volts mark next to it.

If you are on 220 volts house current (non-usa), make sure it is on 220 volts.

http://www1.us.dell.com/content/products/productdetails.aspx/dimen_4700?c=us&cs=19&l=en&s=dhs&~page=1&~tab=viewstab#tabtop

Missed by that much.   : D

LOL  thanks she will try it and I will let you all know  would it have fried anything if she tried useing it with it set on 220?

Probably not.
Better chance of toasting something if you are using 220v and had it set to 110 (115).   : )

if it was the power supply off/ on switch, you only have to push it back to on....

she has tried that didnt do any thing

well, your power supply can be dead, of course, but first, check if you have power coming to the PC.
If it is dea

If it is dead, replace it

Other than that, if you feel working on the insides of the pc, you can open it, clean out all dust, disconnect as many devices as you can and test. you can also measure the voltages on the molex connector : red = 5 V, yellow is 12 V with respect to the black ones.

discribe this mystery button please, I wonder if it is a fuse that tripped because of a short in the system.

a dimension 4700 is going to have 4 lights on the back labeled "A", "B", "C" and "D".  Power on the computer and let us know if each of those lights is yellow, green, or off.  Also, when the computer is powered on, what is the state of the LED in the center of the power switch (can be solid yellow, flashing yellow, solid green, or flashing green).  Please relay this information.

ok when she gets up I will
onedeej  they pushed the button the house teen was messing around   sigh

If the teen turned off the power supply, you would not see lights on the front of the PC except just a flicker, as it cuts all power to the PC off.  Since the Wall Power is only 110v, swithing it to 220v could not have harmed it.

When you turn it on, do you hear it running?  If so, check to see that the Monitor is turned on.

Most lower end Dells sold/made in the US normally do not have a PSU (Power Supply Unit) voltage switch for 110v to 220v, at least the one my son has does not have that option, unless it was not customized online or at a Dell Store.

The last time I visted the Dell Home office in Round Rock, Texas (a two hour drive from where I live), just outside of Austin, they are pondering auto sensing PSU's on the Optiplex Systems.

>>> From this pic, it looks like a 110/220 volt selector switch. Make sure that either:
110 volts is showing on the switch. or
that it is on the 110 volts mark next to it.

If you are on 220 volts house current (non-usa), make sure it is on 220 volts

I agree 100% with Coral74 about his comment, and i guess now the PSU is not working no more.

Have you tryed unpluging the cable from the wall outlet? There is a chance it might reset itself, and start working again.
Other than that, try another PSU, and hope that whatever the "teen" did, it didn't toast something else.

ty sorry it took so long to get back to you with her sced and mine  it was hard to get done
ps I bet I scored more points than you on this one LOL ;)     wayne

LOL   I'll pass on that bet.  Glad it's running again.   : )