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[SOLVED] HP 800 G1 - Startup Issue (fan spins for 1-2 second then shuts down)

HP 800 G1 SFF
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I recently bought a HP 800 G1 second hand. I reapplied the thermal paste, put in 1 stick of ram into DIMM 1 (which I checked works in another HP machine), plugged in the 240W psu connectors (6pin, 4pin and 3rd white connector) and plugged in the cpu fan cable. I then plugged the system into power and turned the powerpoint on, the fan spun up on the cpu cooler for about 1-2 seconds and the computer simultaneously beeped twice. Then fan then spun down and the computer beeped twice, with a 3 second pause between each two beeps,  another 4 times. The red light on the power button flashed with each beep and continued to flash after the beeping stopped. I referred to this site: https://support.hp.com/au-en/document/bph07107. Which suggested that the issue was a cpu thermal issue, however I've made sure to screw the cooler in as far as tightly as I can and the cpu fan connector is connected. I also plugged in another fan (that I know works) that I had lying around into the cpu fan header and it still had the same issue so I know it's not a problem with the fan itself. Any guidance you could give me for troubleshooting this issue would be greatly appreciated.

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[SOLVED] HP 800 G1 - Startup Issue (fan spins for 1-2 second then shuts down)

For anyone else that has an issue that sounds like mine, I solved it by trying another Haswell CPU that I had lying around. It turned out that it was the CPU that was causing the system to have the boot issue, the one I have in the system before must've been dead.

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