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Display Data Channel (DDC) is a collection of protocols for digital communication between a computer display and a graphics adapter that enable the display to communicate its supported display modes to the adapter and that enable the computer host to adjust monitor parameters, such as brightness and contrast.
No RAM installed/detected Three successive tones followed by a repeating five-second pause: Incompatible RAM types; No good banks One long tone while the power button is held down: EFI ROM update in progress (For Macs made until 2012) Three long tones, three short tones, three long tones: EFI ROM corruption detected, ROM recovery in process
A flat-panel display (FPD) computer monitor A cathode-ray tube (CRT) computer monitor. A computer monitor is an output device that displays information in pictorial or textual form. A discrete monitor comprises a visual display, support electronics, power supply, housing, electrical connectors, and external user controls.
Burn-in on a monitor, when severe as in this "please wait" message, is visible even when the monitor is switched off. Screen burn-in, image burn-in, ghost image, or shadow image, is a permanent discoloration of areas on an electronic visual display such as a cathode-ray tube (CRT) in an older computer monitor or television set. It is caused by ...
In normal operation this is not a problem, but while the machine is booting up it will attempt to detect its keyboard and mouse and either fail to boot or boot with an unwanted (e.g. mouseless) configuration. Likewise, a failure to detect the monitor may result in the computer falling back to a low resolution such as (typically) 640x480.
A composite monitor or composite video monitor is any analog video display that receives input in the form of an analog composite video signal to a defined specification. [1] A composite video signal encodes all information on a single conductor; a composite cable has a single live conductor plus earth.
In computing, serial presence detect (SPD) is a standardized way to automatically access information about a memory module. Earlier 72-pin SIMMs included five pins that provided five bits of parallel presence detect (PPD) data, but the 168-pin DIMM standard changed to a serial presence detect to encode more information.
Programmers typically use debugging NMIs to diagnose and fix faulty code. In such cases, an NMI can execute an interrupt handler that transfers control to a special monitor program. From this program, a developer can inspect the machine's memory and examine the internal state of the program at the instant of its interruption.