The system sounds alive \u2014 fans spin up, maybe a drive<\/a> light flickers, the case looks powered \u2014 but the monitor stays completely black with no signal. This is one of the most frustrating PC<\/a> faults to diagnose blind, because „fans spinning” rules out a dead PSU<\/a> but leaves three separate suspects on the table: the GPU<\/a>, the RAM<\/a>, or the motherboard<\/a> itself. This guide isolates which one, in the correct order.<\/p>\n Before touching any hardware<\/a>, eliminate the monitor and cable as variables.<\/p>\n \u2139\ufe0f Technical Note<\/a>: A monitor showing „No Signal” is actively receiving power and detecting no video input at all. A monitor that stays fully black with no „No Signal” message often means it isn’t receiving power itself \u2014 a different problem entirely, unrelated to the PC’s GPU<\/a> or RAM<\/a>.<\/p>\n<\/blockquote>\n If a different monitor and cable still show nothing, the fault is inside the PC<\/a>. Continue below.<\/p>\n Phoenix BIOS Beep Codes: The Complete Motherboard<\/a><\/p><\/blockquote>\n
\nStep 1: Confirm It’s Actually a „No Signal” Problem<\/h2>\n
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