Where is the vertical button on my dell optiplex

Nana, A solid amber power button on your GX520, indicates a motherboard failure. The motherboard will need replaced. Check the attached links,instruction and guides, Good luck
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Solid orange power button on Optiplex GX520
My Dell Optiplex GX520 will not boot Forums
Dell Optiplex GX520 amber solid light no power

There are specific patterns on a Dell that will tell you what the problem is.

http://www.tomshardware.co.uk/forum/275108-30-dell-optiplex-diagnostic-lights

is the orange light flashing? if it is, that would indicate a problem with your power supply or wall outlet to your computer.

IS YOU SURE IT'S THE POWERBUTTUN.AND NOT THE HDD BUTTON .IT SHOULD FLASH WHEN THE COMPUTER READ.?

Not surer what your question i, but...You can program your "Power Button" to do a lot of things or even nothing.
To program go to "Control Panel" "Hardware and Sounds" then select "Power Options".
Hope this helps.

Hello there.

Click here to download and install audio drivers for your Dell OptiPlex GX520.

When the page loads select your Operating System.

Then lower down click the heading Audio.

Now click the download button.
Install the drivers by double clicking the downloaded file.
You may also want to install the other drivers that are available for your computer, like chipset, LAN and VGA drivers.

Take care!
damnor01

You will need to visit the Dell website and download the Windows 7 drivers for your computer. Click their downloads/support button.

Take care!
damnor01

try to remove the power cable on that product and then hold the power button for 8 secs. Reinsert back the power cable and press the power button. If it won't turn on, then the power supply is the main cause of trouble. Contact dell right away for repair...

power off system , disconnect power and press and hold power button to discharge stored power, then remove memory module 1, then reseat it by inserting it with the levers extended to the sides and press down with thumbs until the levers snap in place vertically on their own. if no change, replace module.

if its what am thinking. then you have to holed the mouse down on the bar and drag it to the bottom where you want it to be