Following this thread I was able to resolve my issue. The LEDH1 connector had a wire connecting F pin to K pin. Cutting this wire made mobo to boot up without prompting the error. Thanks.
Got this mobo as a replacement for one that died in an XPS 8700.  2yrk5 has no connector for the front usb panel wires so left it disconnected. The main problem is that this mobo has no system fan connector either, so fan is not connected. On start up I am getting a "System fan failure" error. Ran the system tests available at F12 on start up and got the same error. Why this mobo is checking if fan is connected/working while there is no connector to attach the fan? Is there any way to suppress this error? Planning to connect the fan to a molex connector but this would not eliminate the fan check. Thank you.
System Fan Failure on a 2yrk5 mobo (Inspiron 3647)