Hi, i have a dell dimension 300, the hard drive is 80gb and i want to upgrade to 120gb, when i put the hd in, the resolution on the screen went fuzzy, i went into control panel and tried to adjust the graphics and resolution, first i enden up with icons bigger than the screen, so i reset that, then when i went to adjust the resolution it wouldn't let me adjust it off low setting, also i was wondering if i could put a 400w psu in instead of the 250w. thank you.
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I'm assuming that your power supply simply can't support the new hardware, which is why I'd suggest you do what you suggested. Let us know what happens!