[Discuss] Problem with booting on LINUX Desktop

[Murray Strome]

Ever since I moved I have had a problem trying to boot into the main LINUX desktop computer whether from Ubuntu installed on HD or Live DVD. The following keeps repeating over and over:
————————————-
257.189784] ata4.00: exception Emask Ox0 SAct Ox® SErr Ox0 action Ox6 frozen
257.189819] ata4.00: failed command: READ DMA
257.189855] ata4.00: cm c8/00:08:00:00:00/00:00:00:00:00/e0 tag 10 dma 4096
257.189855]
res 40/00:00:00:00:00/00:00:00:00:00/00 Emask0x4 (timer
+ )
257.189899] ata4.00: status: { DRDY}
257.189934] ata4: hard resetting Link
267.201731] ata4: softreset failed (device not ready)
267.201778] ata4: hard resetting Link
277.033744] ata4: SATA link up 1.5 Cbps (SStatus 113 SControl 310)
279.159986] ata4.00: configured for UDMA/100
279.160026] ata4.00: device reported invalid CH sector 0
279.160068] ata4: EH complete
310.437736] ata4.00: limiting speed to UDMA/33:PI04
310.437774] ata4.00: exception mask BxB SAct Ex SErr 8x8 action ®x6 frozen
310.437810] ata4.00: failed command: READ DMA
310.437845] ata4.00: cm c8/00:08:00:00:00/00:00:00:00:00/e0 tag 11 dma 4096
n
310.437845]
res 40/00:00:00:00:00/00:00:00:00:00/00
—————————————

I did get it to boot once from the HD today and did a software update but it wanted to restart. When I did so, I was back to the same problem. I thought that perhaps something got jarred loose in the move but no idea what. Does anyone have any idea what has gone wrong?
Thanks for any suggestions on where to look or how to fix this?

Thanks,
Murray