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Question CPU Led right after changing GPU, and then after roll back to Old one.

Feb 23, 2022
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Hi, i know it gonna seem like thousands of posts everywhere but im stuck for 4 hours now and done as many ideas as i found. So lets start another one. Just bought RTX 3050 and wanted to place it into pc. Unplugged power supply, removed cover, removed screw and 6pin from GTX 750, took out Old card, placed RTX, plugged 6+2, screw in and turn power back on. Turned PC on but theres no signal. Took a look inside case and CPU Led light was solid red. Then i starded checking web and found something like "it cannot be connected with 6+2 it must be 8". Okay, went back with GTX but cpu Led still solid red. Started to reset bios, clr cmos etc but then friend told be he bad rtx on 6+2 for sure so i went back again now RTX 3050 inside, Led still solid red. Steps ive done: reset bios, clr cmos, another pcie for card, tried single ram on every Channel twice (two sticks) took off cooling and cpu and put it back in, disconnected every cable from back and leave it, holding power button for 1min with disconnected cables. Without GPU still cpu Led red. Like 12 hours ago i was normally using pc for gaming and last upgrade was month ago it was cpu upgrade to ryzen 7 5800x. Im stuck af with no hopes but, maybe i missed anything? I feel really done..

My specs:
Mobo - Aorus b450 elite
CPU - Ryzen 7 5800x
GPU - GTX 750/RTX 3050
RAM - Patriot Viper 4 DDR4 16GB (2 x 8GB)
PSU - be quiet bqt l7-630w
CPU cooler - be quiet pure rock 2