Now that you have some guides to help you fix the HTC EVO yourself should anything hardware-related ever go wrong, you need the actual parts to do it.
Although any number of things could malfunction or literally break on the EVO, one of the most common problems that definitely requires attention is a cracked screen (the hairline crack near the power button is more prevalent, but it doesn't affect usability).
If you didn't opt for the insurance when you purchased your EVO and you can't get a replacement, then you'll need to get it repaired. I don't know how much it costs to have it fixed professionally, but Cellular Parts USA sells the LCD and digitizer if you want to fix it yourself.
You can also get EVO parts on eBay, though considering the problems my husband just had buying a screen replacement for another device, you never really know what you're going to get. In my husband's case, the replacement screen was shipped in a flimsy bubble mailer and of course arrived cracked.