Computer Fan Runs But No Display — 10 Ways to Fix (PC On, Screen Black)

PC on hai, fan chal raha, par monitor blank? 10 ways to fix — RAM reseat, display cable, CMOS reset, GPU check — hardware troubleshooting guide.

PC Troubleshooting Oct 18, 2026 0 6 Add to Reading List

Computer Fan Runs But No Display — 10 Ways to Fix

PC on hai, fan chal raha, lights on — par monitor bilkul black, no signal? Ye boot-level hardware issue hai — 10 fixes order se, 80% RAM/display cable se solve.

Fix 1 — Monitor + Cable Check
Fix 2 — Input Source
Fix 3 — RAM Reseat (Sabse Common)
Fix 4 — Single RAM Stick Test
Fix 5 — Display Cable Port Change
Fix 6 — GPU Reseat
Fix 7 — Integrated Graphics Test
Fix 8 — CMOS Battery/Reset
Fix 9 — PSU/Power Check
Fix 10 — Motherboard Debug LEDs
Hardware Beep Codes
Conclusion

Fix 1 — Monitor + Cable Check

Monitor power light on? Doosra cable try — HDMI/DP cable dead hota hai
Cable dono ends tight — GPU end pe bhi
Monitor doosre device pe test (laptop/phone)

Fix 2 — Input Source

Monitor button → Input/Source → sahi select (HDMI1/HDMI2/DP/VGA). Wrong input = "No Signal" even when PC fine.

Fix 3 — RAM Reseat (Sabse Common)

#1 cause — RAM loose ya dusty contacts:

PC off → unplug → side panel kholo
RAM sticks nikalo → eraser se golden contacts clean karo
Wapas firmly insert — click sunna chahiye
Boot — 60% cases yahi fix

Fix 4 — Single RAM Stick Test

Multiple sticks? Ek-ek karke try:

Stick 1 slot A1 → boot
Nahi chala? → stick 2 A1 → boot
Kaunsi stick dead pata chal jayega

Fix 5 — Display Cable Port Change

Motherboard ke multiple video ports try — HDMI → DP → VGA switch. Port dead ho sakta hai.

Fix 6 — GPU Reseat

Dedicated GPU hai? → nikalo → slot clean → wapas firmly. GPU power cables (6/8-pin) tight check.

Fix 7 — Integrated Graphics Test

CPU mein iGPU hai? → monitor cable motherboard port pe lagao (GPU nahi). Display aaye? → GPU dead hai, iGPU se kaam chalao.

Fix 8 — CMOS Battery/Reset

Motherboard pe coin battery (CR2032) → 30 sec nikalo → wapas
Ya CMOS jumper short karo
BIOS defaults load — stuck boot settings reset

Fix 9 — PSU/Power Check

PSU switch peeche se on hai? (I not O)
24-pin + 8-pin CPU power firmly seated?
PSU test — paperclip trick (24-pin green+black short) — fan chale toh PSU alive
Aging PSU = power insufficient for boot

Fix 10 — Motherboard Debug LEDs

Modern boards pe DEBUG LED dikhta hai — CPU/DRAM/VGA/BOOT — kaunsa lit hai wahi problem:

DRAM lit → RAM issue
CPU lit → CPU/power
VGA lit → GPU/display
BOOT lit → drive/boot device

Hardware Beep Codes

Speaker connected ho toh beeps clue dete hain:

Beeps	Meaning
1 long, 2-3 short	GPU/display
Continuous	RAM
No beep, no display	CPU/board/PSU

FAQ

Fans spin but restart loop?

RAM/PSU — single stick test + PSU check.

New build no display?

8-pin CPU power plug bhool gaye ho — sabse common mistake.

Laptop fan + black screen?

RAM reseat accessible models mein — warna service center.

Conclusion

Fan runs no display = RAM reseat (Fix 3) 60% solve, phir display cable + iGPU test. Debug LED/beep codes se exact component pakdo — guesswork mat karo.

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