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What's the code in verify.php? Are you sure your credentials are correct?
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Check the database is running.<br />
As Ferruccio Accalai asks, check your credentials.<br />
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Is this a 'localhost' machine? Because Bluehost do not sound local.
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I believe you should have a mysql admin option on your Bluehost control panel (can't remember the name of it at present). <br />
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See if you can log onto the database using the credentials in there - if not, ask Bluehost to confirm the correct details for the database.<br />
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if you can access it directly via mysql check the details between that and your coding in verify.php.
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@All of a sudden my websites don't work. &nbsp;When trying to log in I get the following error<br />
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Just in addition.<br />
All of a sudden, so it was working before. Have you changed any code due to MySql version's upgrade? Are you using scripts coded for working with the last php and mysql versions but maybe BlueHost still works with older versions?
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The 3 websites all were working fine yesterday morning and yesterday night are failing.<br />
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No code has been changed... it fact I haven't worked on these sites in quite some time.<br />
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I have not changed credentials but suspect that something has.<br />
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I can get into the databases via phpMyAdmin.
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SO you have to look into the code. Maybe there's no connection to the server or the most bad thing could be any hacking action
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<div class="content wysiwyg-content">
All of a sudden my websites don't work. &nbsp;When trying to log in I get the following error:<br />
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Warning: mysqli::mysqli(): (28000/1045): Access denied for user 'USERNAME'@'localhost' (using password: YES) in /home8/mysite/public_html/<wbr />domain/ver<wbr />ify.php on line 18<br />
Unable to connect to database [Access denied for user 'USERNAME'@'localhost' (using password: YES)]<br />
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Bluehost has been no help.<br />
<br />
Thoughts
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All of a sudden my websites don't work.  When trying to log in I get the following error:

Warning: mysqli::mysqli(): (28000/1045): Access denied for user 'USERNAME'@'localhost' (using password: YES) in /home8/mysite/public_html/domain/verify.php on line 18
Unable to connect to database [Access denied for user 'USERNAME'@'localhost' (using password: YES)]

Bluehost has been no help.

Thoughts

Cannot log into website using MySQL and PHP

MySQL is an open source, relational database management system that runs as a server providing multi-user access to a number of databases. Acquired by Oracle in 2009, it is frequently used in combination with PHP installations, powering most of the WordPress installations.

MySQL Server

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.