I have a Dell Optiplex 745 desktop computer and now it does not work!

Found these Dell™ OptiPlex™ 745 Tech Specs

https://www.dell.com/downloads/global/products/optix/en/opti_745techspecs.pdf



Dell OptiPlex 745 Desktop Product Details



Dell OptiPlex 745 Ultra Small Form Specs CNET



Dell OptiPlex 745 specs Engadget

Drivers are available from the link below.
http://www.dell.com/support/home/us/en/19/product-support/product/optiplex-745/drivers

You will need to have a computer tech with a password recovery tool, fix your issue. Unless you have another admin user on the computer who knows their password.

It is likely your power supply was fried, but this does not mean you are out a computer. Bring it to a local repair shop and they can swap your power supply that can adequately charge your components.

I see this was posted over a year ago ,was this resolved?

If you want to create a new Basic Input/Output System (BIOS) password on a Dell Optiplex 745, reset the password. Resetting the password also applies if you want to remove an existing BIOS password. BIOS passwords are used to add an additional level of security to your machine. Without the correct BIOS password, your Dell Optiplex 745 will not complete the boot process. The password can be reset whether you know your current password or not.

Turn off your Dell Optiplex 745. Start the computer. Press "F2" the moment the Dell logo appears on the screen. You will only have two to three seconds to press the key. Enter your BIOS password. Navigate to the "Exit" screen. Select the "BIOS Password" setting. Enter your BIOS password and a new password if desired. Do not enter anything in the "New Password" box if you want to remove the BIOS password completely. Press "Enter" to save your password settings. Reset Forgotten Passwords Turn off your Dell Optiplex 745 and remove the power cord from the computer. Disconnect any external hardware and cables. Slide the release latch located on the back of your Optiplex 745. Lift the cover as you slide the latch. Hold the cover firmly and pivot it back on the hinges. Remove the cover from the hinges. Find the "PSWD" jumper on the motherboard. This is a two-pin jumper and should be clearly labeled. Use a flashlight and magnifying glass if you have trouble locating it. Remove the jumper from the motherboard. Replace the cover and slide it into place until the latch snaps into place. Reconnect the power cable and restart your computer. Shut down the computer after it has completely restarted. Disconnect all cables and remove the cover again. Replace the PSWD jumper. Replace the cover. Reconnect all cables and restart your computer.
b> Clearing forgotten passwords http://phubner.eng.ua.edu/Files/Optiplex 745/advfeat.htm - wp1117484

Dell OptiPlex 745 Drivers Download for Windows 7, 8, XP, Vista Hope this helps you :)

If you think your vga card is not responding?? just try to insert another vga card in your expansion slot.
Otherwise you mean your computer have no display first try to switch on your pc and try to hear your computer fans are all working..if it is working just try to re install your RAM and u must clean it with a cloth.

if you have a voip software you may use a USB to phone adapter from ebay the setup depends on the software you may be using.

No boot device means that the computer cannot find a drive that has a operating system files and therefore cannot boot up.
This usually means that the hard drive in the computer is faulty.
You need to get a new hard drive and install Windows on the hard drive, together with the drivers for the computer's installed devices and programs to get a working computer.