When i started my pc, the fan will be very noisy and always running on 99%.
CPU temperature during gaming is 70 degree celcius++, non gaming is 40 degree celcius++
Graphic card is radeon 6950

Usually i can play for like 4-5 hours and no problem. After that, my dota2 item ingame item will look weird. For example i have a skull basher on my slot, but i see it as a black box only and nothing shown. Haldway through the game it will be like this and i cant move it around my slot inventory. Some item (non upgradeable) like a ring and scroll of town portal, the item image in my inventory slot still looks ok.

What is the problem?

1. Try update driver.

2. Clean ur gpu's fan from dust.

i dont have any problem when in games, just when starting up at main menu, i have that black box on party box. sometimes it blinking. but so far, no issue. im using gtx960

Last time I got this problem also with my in game items black box after that I updated my driver to latest version so the problem fixed already. I hope it can help u out with this solution.

try "verify integrity of game cache"