So I recently purchased a new Raspberry Pi 4B 8GB from an official store, and it worked well without any problems. After 2 weeks, the Pi stopped booting altogether. Whenever I plug it in, the green light blinks for a fraction of a second, then goes blank. The red light is always on (so the Pi is receiving power). I have tried using multiple power supplies, reformatting and imaging the SD card, trying a different SD card, trying a USB drive instead of an SD card, and cleaning all the ports but it is not giving any signal to the HDMI slot or Display connectors, and I don't think the SD card slot and USBs are even receiving any voltage. The RAM and CPU are not warming up even a little so I think that power is not getting past the power circuitry (the voltage regulators, power dividers etc.) I haven't done any tests with my multimeter because I don't know what to look for. After doing some research I heard that it could be due to a short circuit but I don't know where that could be. I have noticed that if I touch a certain component on the Raspberry Pi, the green light is turning on, but it still isn't working (the USBs aren't receiving power and I am not getting any HDMI signals), while I touch the component. I think it may have something to do with a short circuit or component failure, or grounding, but I am not completely sure.
Sorry for the bad English, if you do not understand something or need some clarification, please leave a comment.