At the time when I opted for a numeric password I swapped router for a wireless enabled version so I could use wireless laptop on my network and the password on the desktop was for windows remote desktop, so I could access desktop files from laptop. At the time I must have down powered the desktop and I now believe this caused the issue. The PC is regularly switched off but power cord remains live - in this case motherboard is always live. On Monday we had a powerful electrical storm and I removed all external cables from my PC in an attempt to preserve all photos across several hard drives in the machine.
The next day I switch on the machine and pressed <num lock> then numeric password but the password not recognised - odd I thought then noticed the num lock light was out. pressed <num lock> followed by numeric password and I got access all was normal.
The next day I noticed number lock was ON without pressing anything at all. It seems cycling power to my desktop has cured this problem - I only suffered for eighteen months!
Thought I would share this and close off this thread :-)
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