My Passport will not mount

My Passport External USB drive no longer mounts. My MacBook Pro would not boot with My Passport connected to an external USB port. Once booted, when I connect the My Passport drive, I cannot mount it:

[System Information > Hardware > USB > USB 3.0 Bus]
My Passport 25E2:

Product ID: 0x25e2
Vendor ID: 0x1058 (Western Digital Technologies, Inc.)
Version: 40.05
Serial Number: 575833314442373532324830
Speed: Up to 5 Gb/sec
Manufacturer: Western Digital
Location ID: 0x14300000 / 4
Current Available (mA): 900
Current Required (mA): 896
Extra Operating Current (mA): 0
My Passport 25E2:
Capacity: 4 TB (4,000,752,599,040 bytes)
Removable Media: No
BSD Name: disk2
Logical Unit: 0
Partition Map Type: GPT (GUID Partition Table)
USB Interface: 0
Capacity: 209.7 MB (209,715,200 bytes)
File System: MS-DOS FAT32
BSD Name: disk2s1
Content: EFI
Volume UUID: 0E239BC6-F960-3107-89CF-1C97F78BB46B
Backup 4Tb:
Capacity: 4 TB (4,000,407,600,128 bytes)
File System: Journaled HFS+
BSD Name: disk2s2
Content: Apple_HFS
Volume UUID: 8A307679-866E-37C5-8605-05989775BC47

[System Information > Hardware Overview]
Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro9,2
Processor Name: Intel Core i7
Processor Speed: 2.9 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 4 MB
Memory: 16 GB
Boot ROM Version:
SMC Version (system): 2.2f44
Serial Number (system): C02J21APDV31
Hardware UUID: D241C662-C176-5A31-8612-F1C57A2A7215
Sudden Motion Sensor:
State: Enabled

macOS High Sierra
Version 10.13.6

MacBook Pro (13-inch, Mid 2012)

In the first screenshot: Select the grayed out WD and press Mount button. Let me know if that worked.
Further, what macOS you are running?

Nothing happens when I click “Mount”

macOS version 10.13.6

When I initial plug the drive into the USB port, the white status light on the drive is on continuously. After a few seconds it begins blinking continuously at a rate of about at least 4 times a second.

Clicking “Info” with the drive selected in Disk Utility I get:
Volume name : Backup 4Tb
Volume type : Physical Volume
BSD device node : disk2s2
File system : Mac OS Extended (Journaled)
Connection : USB
Device tree path : IODeviceTree:/PCI0@0/XHC1@14
Writable : No
Is case-sensitive : No
File system UUID : 8A307679-866E-37C5-8605-05989775BC47
Volume capacity : 4,000,407,600,128
Owners enabled : No
Is encrypted : No
Can be verified : Yes
Can be repaired : Yes
Bootable : No
Journaled : No
Disk number : 2
Partition number : 2
Media name :
Media type : Generic
Ejectable : Yes
Solid state : No
S.M.A.R.T. status : Not Supported
Parent disks : disk2

It can be verified and repaired by Disk Utility (as per the report). Do you any important data on this drive? If NO then format it with MacOS Journaled.