|Try a different monitor with the HD 6850, or try the monitor with another computer, if you can. However, there's probably nothing wrong with your monitior. |
Try removing the AC power to the case, remove the HD 6850 card, wipe off it's contacts with a tissue or a soft cloth, don't touch the contacts with your fingers after that, install it again, fasten it's bracket.
If the card's fan and heat sink has accumulated mung (dust, lint, etc.) on it, clean that off, but DO NOT use a vacuum cleaner to do that - they produce a tremendous amount of static electricity when running which can be discharged from anything connected to them or your body to anything on the card or anything inside the case and cause damage.
Similarly, clean off the CPU's fan and heat sink, and the power supply's fan(s) if it has mung on it
Restore AC power, and try the computer for a while.
If you get symptoms while booting the computer BEFORE Windows loads or when you're in the bios, they CANNOT be caused by software problems on the hard drive.
In any case, it sounds like you have a hardware problem, NOT a software problem.
If you ONLY get symptoms when the computer has been on long enough for it to get to it's normal temp inside the case, e.g. at least a half hour, your problem is heat related.
"powerpack is 600W by X-Power ATX-600TD."
ATX-600TD found here
However, I can't find any info about it's warranty on that web site.
It has two PCI-E 6 pin connectors.
Your HD 6850 card has two 6 pin power sockets on it. Both sockets must have power connectors plugged into them.
DO NOT use a PCI-E Y wiring adapter - one PCI-E connector to two PCI-E connectors - with one PCI-E connector in the power supply's wiring to connect to the two power sockets on the card. That will NOT be able to supply enough current to the card's video chipset.
A similar PS on their US web site:
It has a one year warranty.
One year warranty = it's an el-cheapo power supply model.
Good quality power supplies have at least a three year warranty.
ALL their X-power power supplies appear to have a one year warranty on that site, and that probably applies to your model too.
Your power supply may be in the process of failing.
Check the readings of the three primary voltages coming from the PS in the bios to see if any of them are out of whack.
See response 4 in this:
Even if none of those are out of whack.....
The only way to rule that out for sure is to try another power supply that has at least a 500 watt capacity with your system when the HD 6850 card is installed.
If you can borrow such a power supply from another working system, try connecting that to your computer and using the computer for a while.
If you can install the HD 6850 card in another working system that has a PS capacity of at least 500 watts, or not a lot less than that, try that.
If your power supply IS failing...
Don't buy an el-cheapo (in quality) PS.
See response 3 in this:
I no longer recommend Cooler Master, AOpen, or Sparkle power supplies.
I'm now downgrading Thermaltake to middle of the road.
Antec has two lines of PSs - the better line has a longer warranty for the same or similar capacity - the other line is more towards middle of the road.
AMD has a list of Certified (tested and found to be good quality) PSs:
"it should have been 0T568R"
That's still relatively useless to me / us.
Drivers & Downloads
Studio XPS 8100
Service Tag: 5W4JQ4J
Dell Studio™ 8100
Integrated Intel Graphics Media Accelerator HD
Discrete PCI Expres X16 card
DC Power Supply
Wattage 350 W
Did you try using the HD 6850 BEFORE you replaced the PS ?
, or - Did you install both the 600 watt power supply and the HD 6850 at the same time ?
Try removing the card and using the onboard video, if you can connect to the DVI or HDMI port. If you still get symptoms with the onboard video, either the mboard is damaged or defective, or the power supply is in the process of failing.
NOTE that a DVI to VGA gender adapter plugged into the DVI port may NOT work to produce video on VGA connected monitor - it may be wired up to DVI-D specs, not DVI-I specs that support both a DVI and VGA connection.
I've never come across, or heard of, a DVI port on an actual video CARD (it isn't a CARD unless it's installed in a mboard slot and is removable) that is not wired up to DVI-I specs.