Loading Raspbian OS on Raspberry Pi 4 model B

Hardware you will require:

1. Raspberry Pi 4 B (with RAM - 1GB / 2GB / 4GB)
2. Raspberry Pi 4 B Case cover & Heat Sink.
3. HDMI to Micro HDMI Cable.
4. SD Card (minumum 8GB size)
5. Raspberry Pi 4 B Power Adapter. 
6. A temporary PC / Laptop to download & burn Raspbian OS on SD Card.

Buying quick links you can refer:

	Raspberry Pi 4 B (2gb RAM): https://amzn.to/3aL6GeE
	Raspberry Pi 4 Model B Cover Case: https://amzn.to/2X8H3QY
	Raspberry Pi 4 B - Power Suppy: https://amzn.to/2x7xKpR
	HDMI to Micro HDMI Cable: https://amzn.to/39Q8NN6

STEPS :

1. Download Raspbian OS from below link to your PC
   https://www.raspberrypi.org/downloads/raspbian/
   
   Raspbian Buster with desktop and recommended software
   Image with desktop and recommended software based on Debian Buster
   Version: February 2020
   Release date: 2020-02-13
   Kernel version: 4.19
   Size: 2530 MB
   Release notes
   Download Torrent Download ZIP (links copied from www.raspberrypi.org website. )
2. Download Etcher software to your PC- we will use it to  copy Raspbian OS to SD card. https://www.balena.io/etcher/
3. Insert SD card in your PC.
4. Start Etcher software
5. pass 2020-02-13-raspbian-buster-full.img to Etcher software.
6. Echer will automatically detect your SD card.
7. Click Start to copy OS to SDCard. (It will take 15-20 mins to copy & verify)
8. Remove SD Card from your PC.
9. Insert the SD card in Pi4 SD Card slot.
10. Connect HDMI to your display & Pi 4's HDMI 0.
11. Connect Power Adpater to Pi 4.
12. Power on the Pi4.
13. If you see red & green led blinking in R.Pi4 then you will see your display working in 1-2 mins.

Initial first screen you see after powering on the Pi 4 is this :

enter when prompted for username & password -
default username: pi
default password: raspberry

Next you will see the desktop as below:  

Troubleshooting HDMI Display Issues in Raspberry Pi:
If you are using Raspberry Pi for the 1st time & HDMI display is having no signal then:

1. Remove the SDCard from your Pi and open the SDcard it in your PC or laptop.
2. Search for config.txt and open it to edit.
3. remove the # from the starting of following lines in config.txt to un-comment it.
   
   hdmi_safe=1
   
   hdmi_force_hotplug=1
4. update config_hdmi_boost= 4  to below line
   
   config_hdmi_boost=9
   
5. Save the config.txt on the SD Card with these changes .
6. Insert SD Card back to Raspberry Pi.
7. Power on your HDMI display TV/Monitor.
8. Power on your raspberry pi .
9. Check your cables are connected well (there may be loose connection near micro HDMI port sometimes so check that end.)

And this should make your display working. Let me know if you are still facing issue. But these steps should mostly fix your issue.