Thanks. I'll give that a go ... once my machine boots again.
It was booting intermittently for a while (and I had not had a chance to dig down and determine the cause).
However, today it's stopped booting altogether. I see the following on the screen:
ACPI Error: [DTGP] Namespace lookup failure, AE_NOT_FOUND (20140828/psargs-ldl)
ACPI Error: Method parse/execution failed [\_SB_.PC10.XHC_._DSM] (Node ffffff80a1ef7550). AE_NOT_FOUND (20140828/psparse-270)
pci (build 16:59:56 Mar 3 2017), flags 0xe1000, pfm64 (39 cpu) 0x7f80000000, 0x80000000
...
*IOAHCIBlocksStorageDriver:etermineDeviceFeatures - !!!!! WARNING !!!!! - Fore Data Set Management is set
...
LS(4728) Little Snitch: start
...
ARPT: 1.812041: srom rev:11
000001.817821 AppleUSBHostResources@: AppleUSBHostResources::allocateDownstreamBusCurrentGated: assuming successful wakeUnits 150 sleepUnits 0
ARPT: 1.824276: ChangeVCO => vco:960, xtalF:40, frac: 98, ndivMode: 3, ndivint: 24
000001.831538 AppleUSBHostResources@: AppleUSBHostResources::allocateDownstreamBusCurrentGated: assuming successful wakeUnits 150 sleepUnits 0
000001.832510 AppleUSBHostResources@: AppleUSBHostResources::allocateDownstreamBusCurrentGated: assuming successful wakeUnits 150 sleepUnits 0
ARPT: 1.839017: Data written into the PLL_CNTRL_ADDR2: 00000c31
ARPT: 1.839183: Data written into the PLL_CNTRL_ADDR3 (Fractional): 0000100e
and it's stuck at this point.
Have you seen this?
Thanks for any suggestions you might have.
-- Mark