Go to Dell.
http://www.dell.com/support/home/us/en/19
SOURCE: dell desktop optiplex 745 it
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.
SOURCE: My Dell Optiplex 745 Desktop
Hello,
The orange blinking on your desktop power button says that there's a problem with either the power supply or the motherboard itself.
Please refer to this link for the diagnostic lights on dell computers.
What you can do is:
1. unplug the power cord
2. press the power button, hold on it for more than 5 secs
3. re-plug the power cord on your CPU
4. test if it the system will work.
If this troubleshooting step does not help, that means it is more likely that the problem is with the motherboard.
Hope this helps!
SOURCE: dell desktop optiplex 745 its
purchased a video card maybe the built in video card already have a problem, it think there is a available slot for the video card for you to put.
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