E6420 Laptop won't boot - Recovery non-responsive

Hi,

I have an E6420 Laptop. It wouldn't boot today and I can't get windows recovery to boot either from the HDD or a USB drive. So I tried the Dell Diagnostics test from USB. I tried running the tests associated with OS won't Start. The following tests failed:

Interrupt Controller PIC Functionality Test Failed. Error code "4C00:0522".  Msg "SYSTEM - The interrupt controller, or a device attached to it, is not working".

SATA Disk Read Test Failed. Error Code "0F00:0232". Msg "DISK_0 - Block 64382024: Timeout waiting for IRQ" 

SATA Disk SMART Long Self Test Failed. Error Code "0F00:075D". Msg "DISK_0 - The self-test failed the read portion of the test".

SATA Disk Verify Test Failed. Error Code “0F00:1A32”. Msg “DISK_0 – Block 64382024: Timeout waiting for IRQ”

What do these mean? HDD failure, have to replace it?

Thanks,

Brent