Different blank admin page problem…

Hoping someone else has encountered this problem and knows a possible solution.

Suddenly a few days ago I started getting blank pages when logging into the dashboard. I went through the standard disable plugins, theme, etc., and nothing.

Then, I discovered that it was happening on 4 different sites. I could log in, but just a blank page after login. All 4 sites. So I tried logging in on a different computer, and no problem. On 5 other computers, I can log into all 4 sites with no issue, all works fine. On my main computer, however, I can log in, but get a blank page afterward on all 4 sites.

I have, of course, tried clearing cache and anything else I could think of. I’ve also tried FireFox, Internet Explorer, Chrome, Opera, and a couple no-name browsers, all the same.

So, this is only happening on one computer only, but no others. On this computer, it’s happening in all installed browsers (at least 6). I’ve cleared caches, cleared history, all that. Restarted the computer a number of times. Hadn’t installed any odd software before this started happening. Looked through Processes and Services and didn’t find anything. Very odd.

WordPress version 4.7.5 – 2017 theme.

If anybody has any thoughts on what the problem might be, I’d appreciate it…