Epson Equity 486DX2/50 PLUS User Manual - Page 163

9. If you installed an EGA or VGA display adapter card, or another type of card that you want to be the primary display adapter, you must set jumper JP4 to disable the built-in VGA adapter. Otherwise, you will not see any display on the screen. See "Changing the Jumper Settings" in Chapter 6 for instructions. If you are using one or more display adapter cards, you may also need to change the setting of jumper JP6. This jumper tells the computer whether you are using a color or monochrome monitor. (JP6 is set for color at the factory.) When this jumper is set incorrectly, you see a CRT error message. If you are using two different video cards, set jumper JP10 to the primary monitor type. See "Changing the Jumper Settings" in Chapter 6 for instructions. 10. If your computer suddenly stops operating, its power supply thermal detection circuits may have detected excessive operating temperatures and automatically shut down the power. This protects your system from damage due to overheating. When these circuits detect a high temperature, they shut off all the DC outputs in the power supply and cause it to go into latch-offstate. This does not damage the power supply, but you must correct the temperature problem before you can use your computer again. See "Restoring the Power Supply," below. B - 8 Troubleshooting