Screen goes black or others colour after logging into Windows Profile

[Rong]

This only happens when I log into my profile but not so apparently, when I log into my sister's or mum's profile. I checked the state of my gpu. It's fine in working condition. How do I fix this?

[Anupam]

The problem might be particularly with your profile, since the other two profiles are working without this problem.

So, you should check your own profile, for problems. If there is a separate administrator account, then from that account, you can check your profile. There might be some program scheduled to start when you login... that program might be causing this.

[Rong]

That sounds logical. How do I check the start up programs, profile wise?

[Anupam]

Yours is an administrator account, or an ordinary account?

I will tell regarding Win XP, because I don't have much idea about Vista.

In XP, to check whats in a startup folder, you can go to:
C:\Documents and Settings\$Username\Start Menu\Programs\Startup

In place of $Username, name of your profile will be there. In the Startup folder will be any programs that are scheduled to run on startup.

There are other startup programs too, which do not show in the Startup folder, but still, they do run on startup. You can check such startup programs, with the help of softwares like Codestuff Starter.
Another such simple software is WhatInStartup from NirSoft.

You can use these softwares to know what programs are there in startup, and you can either look for suspicious programs, or you can also post the report here, and someone would possibly be able to tell something.

Since you are not able to login using your profile, then this should be done from the administrator profile.

Hope it helps.