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I have raspberry pi 4 and when I boot it with sd card(I have tried to install with dd, rpi-imager, etcher, I have tried ubuntu, kali, raspberry) and It's allways stuck on rainbow screen. When I take same sd card and put it in raspberry pi 3 it works. When it powers on red LED lights one and green blinks 3-4 times.

I have tried:

Raspberry pi 4 stuck on rainbow screen, green LED flashes 4 times

Won't boot after removing and inserting the SD Card?

Green LED blinks 4 times, did I brick my Pi?

PI 4 sometimes doesn't boot after rebooting from command line

This happens with both screen connected and not connected. It's not power problem.

thisdoulsdowrk
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Sorry to hear about your problem. Now at this point I must ask the capacity of the SD card you're using and also the speed of it. It is really important that you use a class 10 SD card for a cheap alternative of class 4 would take ages to boot. And talking about the capacity, the official website says that you can use any capacity more than 8 GB but it's important to know that you need to format the card in a FAT32 format. FAT32 file format is default when you're using capacity between 8-32 GB. but in case of higher capacity Disk (like 64 GB or 128 GB) the default file system gets changed to either NTFS or exFAT. NTFS is a microsoft patented technology, unavailable file format on your Raspberry pi4 B, exFAT is also not supported till today. If it happens that you have a higher capacity disk (sd card). Please use a third party formatting tool called SD CARD Formatter. There you will get a prompt to select the type of File System you need to format to. Select the FAT32 format but I must tell that you won't be able to utilize full 100% of the capacity. That's all mate! Have a great day.

Dhrubojyoti Dey
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    If you are flashing an image you do not need to format the sd card. Read OPs other post for sd card sizes. – CoderMike Jun 09 '20 at 11:36