My PC (Dell Optiplex 755) was working fine till last night but when i open today it shows (stable) orange light at start up instead of yellow light, what is the possible problem and please help me to resolve this issue.
RE: Dell Optiplex 755 shows orange light at start up
Welcome to the Dell Community Forum.
The power light being solid amber indicates the power supply is functioning, but the system is not processing data. Most likely the motherboard is gone bad, however you may try the following steps from the link http://dell.to/1pO66Ro