Hi, this problem has occurr ever since I first bought this pc. I have an HP Pavilion Notebook 2620 ds. I run Windows 8.1 which was updated from original system 8.0. I have read every solution on Windows 8 forum and HP forums. nothing has helped. While typing, my cursor disappears every 5 seconds. I have to move my mouse cursor to align exactly with the last letter & click so I can type again. Simultaneously, the top of my desktop page changes from blue to gray, and my cooling fan increases speed. I use my internal cooling fan. Also, when I try to move a picture in My Pictures, the drop down menu will disappear. Renaming pictures is almost impossible because my cursor ma disappear in only 1 second, or it may last 5 seconds. Originally, my cursor would disappear every 10 seconds and reappear after 5 seconds. After a Chkdsk run, the problem changed to what I described above. I have looked for 3rd party software, & removed anything I don't need. This problem started before I added any software. I was given a link once that solved my problem,but I didn't write it down. When I upgraded to Windows10, decided I didn't like it and went back to Windows 8.1, my problem began again. I have run my antivirus program, Advanced SystemCare Pro 9.1, I have checked disk, ran my Disk Doctor, I have done a Safe Boot. The problem didn't occur in Safe Boot but that didn't tell me much. I'd appreciate any help you can give me. Thanks!