Optiplex 740 Computer Won't Start
1. Verify it is plugged in.
2. Press power button.
- does your power supply have a switch on it? Look for a black rocker switch
3. Do you hear a beep?
4. If you hear a loud continuos beep, power down the Machine and unplug it.
5. Hold power button while PC is off, it may come on for a second.. This is called "bleeding the capacitors"
6. Open the side of the case.
7. Find the RAM (random access memory), they are long rectangles about 6inches by 1inch. Remove one.
8. Plug in power cable and start computer with one stick of RAM, problem solved, you have bad ram.
9. Remove all PCI cards, and cards that are in the back of the computer. Remove them from the white slots, there is a small screw on the side near the back of the computer to unscrew, you will need to remove a small black door that holds the cards in place. BE SURE power cable is unplugged.
10. Power the computer on. If your computer turns on, you win.
Power down Machine and add cards until it doesn't work, the card you insert and causes the computer to not boot is the card that is shorting out.
11. When you plug in the computer are there any lights on the mother board. If so at least your power supply is working.
12. No light? You need a new power supply. There are 4 screws on the outside of the case where you were plugging and Un plugging the power cable. Remove screws and remove power supply, you will need to disconnect all connections. Type any and all numbers into an Amazon search and spend the $25, Amazon is safe.
13. If you are "posting" entering the BIOS (basic input output system) you're not in bad shape. This means your power supply is working and rh motherboard is working.
14. Restart computer and keep pressing f2, arrow over to advanced, then down to "boot options" make sure your hard drive is on top of the list" if it is not, move it there.
15. press F10 to exit and save changes.
16. If USB is first in the list and you have a USB stick in your machine it will try to boot from it! Take it the USB stick!
17. Press F8 to run safe mode.
18. See how it boots or if it does.
19 restart and try to boot
20. May need to run repair
21. Google search how to get a repair disk for your operating system.
on Jan 12, 2015