Is it my graphics card or something else

[tankbrm]

So I'm playing diablo3 and my monitor goes to sleep. My graphics card fan goes in to high gear and I cant get any signal for my monitor. Sometimes there is a buzzing noise also. I have to restart to computer to be able to do anything again. I looked at my logs to see what the heat got to and the highest was only 51 cel. There is some dust in the card but nothing is blocked. I have plenty of fans(7). Its a radeon hd 6850 card. Had the card for about a year now. This problem started last week and is getting worse. The issue can happen on loading a game or after playing for a few hours. My specs are
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110622-1506)

System Manufacturer: HP-Pavilion
System Model: AY747AA-ABA p6310y
BIOS: BIOS Date: 11/12/09 14:45:05 Ver: 5.13
Processor: AMD Athlon(tm) II X4 630 Processor (4 CPUs), ~2.8GHz
Memory: 6144MB RAM
Available OS Memory: 6144MB RAM
Windows Dir: C:\Windows
DirectX Version: DirectX 11
Card name: AMD Radeon HD 6800 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: ATI display adapter (0x6739)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_6739&SUBSYS_31101682&REV_00
Display Memory: 3825 MB
Dedicated Memory: 1010 MB
Shared Memory: 2815 MB

[babash*t]

Where was the noise coming from? The monitor or the card? Are those temps for the CPU or GPU?
I think the problem might be your card... I'm guessing a bad overclock, overheating, or an electrical short (you may also want to test voltages of it PSU)

[qubit]

I reckon it's your PSU - those big-name prebuilt boxes don't tend to come with very powerful PSUs and they're certainly not made to enthusiast grade standards.

What is its power rating?

[de.das.dude]

Overheating seems to be the most probable issue here.

[DarkOCean]

What psu do you have, its anything overclocked?

[1nf3rn0x]

Originally Posted by tankbrm

I looked at my logs to see what the heat got to and the highest was only 51 cel. There is some dust in the card but nothing is blocked. I have plenty of fans(7).

It's probably PSU, since it only occurs playing games. It probably has a 350w psu which is near not enough. Tell us the model or the psu the case has. Open the side of the case.

[tankbrm]

I have a 600 watt psu and its not the card. I put a new card in and had the same issue. I'm thinking there may be something wrong with my motherboard. At this point I really don't know. I wasn't overclocking the card at all. The noises come from the case somewhere.

[qubit]

Originally Posted by tankbrm

I have a 600 watt psu and its not the card. I put a new card in and had the same issue. I'm thinking there may be something wrong with my motherboard. At this point I really don't know. I wasn't overclocking the card at all. The noises come from the case somewhere.

The buzzing noise is very likely to be the PSU, else it might just be a fan - try to temporarily unplug them and see if the noise stops. A buzzing PSU could mean signs of failure, so you should try another PSU if you can. This kind of blackout is a typical symptom of a bad PSU.

[95Viper]

Originally Posted by tankbrm

I have a 600 watt psu

The original PSU in that system was a 300 watt.
You changed the PSU then?
What make and model?

Try removing driver and re-installing.
Check your administrative events to see what is going on when it goes to sleep. Any warnings or errors?
Dis-able sleep and hiberbation, then try it.
Re-set the CMOS.
OCing anything?

Like has been said before... locate the buzzing noise. Might give you a clue.

[de.das.dude]

something or the other is overheating. did you check your CPU?
can you post some pictures of the case and inside?

[plywood99]

Thats pretty much a heat issue. Blow out your entire system. And not just with those duster cans. They really don't have the "oomph" needed to properly clean all dust from your computer.
I'm a a carpenter so i have a air compressor at hand and use it to blow out my system every couple months or so. It's amazing the amount of dust that can collect in a computer over a short period of time.