Having problems with your Dell Optiplex 755 Desktop Desktop Computer ?

My computer turns on but the screen is blank. The fans in the computer are running. I hear a beep when I turn the computer on, but there is not boot up sound. My monitor screen is blank.


Answers :

First check num lock status if it is on and off when you press num lock\015\012key of keyboard then your cpu gives display to monitor for that when\015\012you power up the computer press F8 key then enter in enable vga mode\015\012then go to start ->control panel->display->settings.
Change screen resolution to 1024*768 then apply and ok.
But num lock key is constant then open the cpu cabinet and refix RAM memory .Reattch both connection to harddrive.
Pull cmos cell from motherboard for 10 minutes so all settings goes to factory defaults.
Remove pci cards from motherboard if any Reattach VGA card to motherboard.
Open processor fan and processor then reattach both.
Make sure motherboard is not ground with cabinet.
Then check.
If you got display but not boot up then you need to make sure that harddrive is recognized in bios.
For that when you power up press F1 or F2 or "del" key then you can see bios then make sure harddrive is detected then save settings and restart.
Let me know if you need further assistance.
Thanks for using FixYa.
Repair Help & Product Troubleshooting for Dell Optiplex 755 Desktop Desktop Computer

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