F5F Stay Refreshed Hardware Desktop CPU fan activates yet the screen, mouse, and keyboard remain inactive.

CPU fan activates yet the screen, mouse, and keyboard remain inactive.

CPU fan activates yet the screen, mouse, and keyboard remain inactive.

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SuperJ917
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04-06-2023, 06:37 AM
#1
Here’s a revised version of your text:

When I turn on the PC, the CPU fan activates and the motherboard LED lights up, but no signals reach any external devices like the monitor, keyboard, or mouse. It seems the HDD is also receiving power during startup, which produces a sound. Interestingly, the chassis fan powered by the PSU isn’t working at all. This happened after months of noisy operation.

I’ve attempted several fixes: cleared CMOS data by removing the battery and using the jumper, replaced the CMOS battery, and even swapped to a different PSU. I checked the ATX connector’s power output and confirmed it was normal. When I powered on with just the RAM, there was no beep sound—though the speaker wire was connected. I cleaned and reinserted the RAM, polished the CPU socket, and reapplied thermal paste. Still, nothing resolved the issue.

The problem began two weeks ago, when the PC would randomly restart without a blue screen. I ran a RAM test using software from USB directly in BIOS, which also caused reboots. I tried booting in Safe Mode to check components—CPU, GPU, RAM, and HDD all tested fine. After a two-hour hibernation, the fan activated but no other devices responded. When I resumed, everything remained stable for a week.

Last week, after restarting from hibernation, the fan turned on but nothing else worked. I let it sit for a while, then inspected again and the issue persisted. I reinstalled RAM and changed the CMOS battery, but it didn’t help. After two days away, the PC booted up showing all installed parts and asked me to continue through BIOS setup, though no keyboard input was registered (the keyboard LED stayed on). Restarting again didn’t improve things.

I checked the voltage output at all connector points and confirmed it was within range. I cleared the BIOS, drained any residual charge, and powered it up without any extra components. Still, the problem remained.

I purchased a new PSU, opened the case, cleaned the CPU socket, and re-applied thermal paste—still no success.
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S
SuperJ917
04-06-2023, 06:37 AM #1

Here’s a revised version of your text:

When I turn on the PC, the CPU fan activates and the motherboard LED lights up, but no signals reach any external devices like the monitor, keyboard, or mouse. It seems the HDD is also receiving power during startup, which produces a sound. Interestingly, the chassis fan powered by the PSU isn’t working at all. This happened after months of noisy operation.

I’ve attempted several fixes: cleared CMOS data by removing the battery and using the jumper, replaced the CMOS battery, and even swapped to a different PSU. I checked the ATX connector’s power output and confirmed it was normal. When I powered on with just the RAM, there was no beep sound—though the speaker wire was connected. I cleaned and reinserted the RAM, polished the CPU socket, and reapplied thermal paste. Still, nothing resolved the issue.

The problem began two weeks ago, when the PC would randomly restart without a blue screen. I ran a RAM test using software from USB directly in BIOS, which also caused reboots. I tried booting in Safe Mode to check components—CPU, GPU, RAM, and HDD all tested fine. After a two-hour hibernation, the fan activated but no other devices responded. When I resumed, everything remained stable for a week.

Last week, after restarting from hibernation, the fan turned on but nothing else worked. I let it sit for a while, then inspected again and the issue persisted. I reinstalled RAM and changed the CMOS battery, but it didn’t help. After two days away, the PC booted up showing all installed parts and asked me to continue through BIOS setup, though no keyboard input was registered (the keyboard LED stayed on). Restarting again didn’t improve things.

I checked the voltage output at all connector points and confirmed it was within range. I cleared the BIOS, drained any residual charge, and powered it up without any extra components. Still, the problem remained.

I purchased a new PSU, opened the case, cleaned the CPU socket, and re-applied thermal paste—still no success.

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