Cannot sign into one website with any browser

I have a Windows 7 Professional install on a newish laptop that is unable to sign into one particular website. I can navigate to the website ok, enter the user-id and password (which works fine on other machines with the same setup) but when I press enter the fields go blank with no error message. I've tried IE11, Chrome & Firefox, disabling the firewall and AV software, swapping between the wireless adapter and the ethernet adapter, running the Microsoft fix for the hosts file, flushing dns, changing machine name, creating another user account on the machine, resetting IE to default settings, putting the website into a trusted zone, running Ccleaner to clean out cookies and temp data and quite frankly I'm at a loss as to what to do next.


I've enabled event logging in IE through a registry setting but nothing is logged.


The website can be signed into on other machines with Win 7 and Win 8 running IE or Firefox with no special setup and the same userid and password so it appears machine specific but what it is beats me. My next idea is to swap the hard drive into another identical laptop to see what happens....
Any ideas considered !

Wow. You have tried a lot.

While in Chrome, press F12 and see if anything is not getting thru.

Just some ideas: Maybe something in the Credential Manager (Control Panel - User Accounts - Manage Accounts - Manage Your Credentials)

Content/URL filtering on the router? Would it log in from a Live Linux boot?

Run in cmd: netsh winsock reset

Since this machine is one of four identical laptops, all with the same initial software image, I moved the hard drive into another laptop (call it A) and put that laptops hard drive into this one (call it B). Much to my surprise I was able to log into the website successfully on laptop A with image B but not with image A on laptop B. I swapped the drives back and was unable to login with image B on laptop B but able to login with image A back on laptop A.

So astonishingly it has to be a hardware fault. I swapped memory modules over, flashed the Bios to the latest level, ran on-board diagnostics but found nothing.

My next job will be to convince the vendor that the laptop, which is still under warranty, has a genuine fault since I doubt their testing will find anything.

Hmm, try changing MAC address then (Win7 MAC Address Changer v2.0) - last 2 couple should be enough. Or else I would first try connecting to modem directly and try resetting router to factory defaults after a power cycle if still not fixed.

I should have added that I'd previously tried it on two different networks in two different locations (the school network and my home network) and still had the problem...

(I would still try MAC change, takes a few minutes.)

In that case, try loading defaults in BIOS. How to Clear Your Computer?s CMOS to Reset BIOS Settings

Perhaps also try with Linux Mint MATE too.

I tried changing the MAC on both adapters and resetting the BIOS but no change in the fault.....

Tried with Linux (Mint MATE)?

Also if you haven't already: SFC /SCANNOW Command - System File Checker

Another thing I could think of is some auto-password program gone corrupt.

I haven't tried Linux Mint Mate as yet, I have got Linux Lite on a bootable USB stick which I could try easily, it would be interesting to see if I could access the web site that way.. Given that when I put this disk into another identical laptop the website can be logged into I had excluded it being a software bug - as far as the disk image goes...