A Win7 Home Premium, Lenovo v570 laptop was freezing while loading normal mode, while loading safe mode, and while loading the BIOS. When it (randomly) made it into windows, it ran fine until I ran firefox, then it would freeze, or go very slowly.
The internal temps were fine. SFC scannow said no probs. Malware scans were fine. RAM testing programs said RAM was ok, plus, laptop still hung with either RAM stick alone).
I ran chkdsk /r, and this seemed to fix everything. No more freezing before or after windows loaded.
Most HDD diagnostic tools weren't detecting or working with this HDD, and the ones that gave me info suggested the drive needs replacing. (Obviously). To get as much life out of drive as possible, I wanted to run Primochenko's "HDD Regenerator". To do so, I had to change the HDD SATA controller from AHCI mode to Compatible (IDE). (FYI each mode change was done with a registry edit to "Pciide" and then also in the bios). HDD Regenerator fixed a few sectors. I noticed wifi adapters didn't work in IDE mode so I switched back to AHCI. I tested everything, it was all good. I shutdown the laptop.
Then about 6 hours later I fired it up again -- and the problem came back, even worse: freezing in the bios and/or windows loading screens again. To be sure I tried swapping ram again, no help. I notice that hiren's boot disk does NOT detect the HD in AHCI mode. And regardless of mode, most of hiren's DOS programs crash / exit.
Finally I used ERUNT (run from IDE mode, Hiren's Mini XP) to restore the registry to the copy I made at 11am this morning. (But NOTE - ERUNT replaced more than 5 files, about 10-15 files. BUT the main 5 hive files were NOT replaced, I had to do that manually.) After I replace the registry, I get blue screens on reboot until I switch the bios back to AHCI.
NOW, I get to windows "LOGIN" screen... But I can't input any text or move the cursor. Even if I try an external usb keyboard. The laptop MIGHT be frozen, but I think the mouse/keyboard were disabled by the registry replacement. Same issue in safe mode. BUT mouse & keyboard work fine in the BIOS, in the "boot options / safe mode choices" screen, or when I boot from boot dics like Hirens. (USB legacy support is ON in bios, but USB keyboard doesn't work either.)
(1) (MOST URGENT) What do you think disabled the mouse/keyboard input?
(2) The freezing of BIOS (before we get to windows loading) indicates HARDWARE issue, ie HDD, right?
(3) Could the freezing be caused by AHCI mode, in conjunction with the bad HD?
(4) Is it normal that diagnostic boot discs don't see a HDD when it's in AHCI mode?