Posted 03 February 2008 - 04:16 PM
I had this problem about a year ago. It was intermittent but when it happened I also had to reboot to get it back, then I found that if I pressed CTR-ALTor maybe it was Control (I can't remember for sure) a box appeared asking if I had forgotten my passport this box would accept it and I could then sign in without the reboot. I tried several times to get advice on how to fix this without luck.
I persevered with it for a while then while following a tutorial on something completely unrelated I found that in Control Panel-Sounds and Audio- Sounds, I had less entries listed in my account than my daughter(who shares this PC with me had in hers). I had previously noticed that certain sounds ie that rustling sound you get when you empty your Recycle bin had disappeared. Anyway to cut a long story short I posted the problem on a couple of sites and got a reply from a guy at AumHa Forums who walked me through how to delete my sounds and copy and import my daughters. This solved that problem for me and also since then I have never had a vanishing sign in cursor either. I don't know enough about PC's to know how they were related but it solved the problem for me.
Not sure if this is any help but it won't do any harm to have a look.
Motherboard: Gigabyte GA-MA770T-UD3, CPU: AMD Athlon II X3 450 Processor, Memory: OCZ 4GB (2x2GB) DDR3 1333MHz,Graphics: PowerColor HD 5750 1GB GDDR5,
PSU: Corsair 430W CX PSU 4x SATA 1x PCI-E, Hard Drive:Samsung SpinPoint F3 500GB Hard Drive SATAII 7200rpm 16MB Cache.