My computer has an Intel Core 2 Duo E6550 2.33GHz CPU, an Nvidia nForce 680i SLI mobo, a Sapphire Radeon X1950 videocard, and Windows XP. Since installing a new stick of RAM, the screen remains black when the computer is turned on. The monitor turns on, but the screen remains black.

I tried reinserting the graphics card, but there was no change. I also tried changing the monitor and the cable, but the result was still the same. Is there something wrong with the graphics card?

The details of your dilemma are a little fuzzy, but the Doctor is going to work on the assumption that your rig was completely fine up until the point you added RAM to the motherboard. To diagnose the problem, first remove the newly added RAM—but only after you have powered down the PSU and fully discharged the machine.

Why? Well, the PSU is built out of big fat capacitors that store an amazing amount of energy. You should never remove or add a component to a PC while the PSU is still plugged in; you should make sure the PSU is completely free of any charge as well. You can accomplish this by unplugging the power supply and hitting the power button on the front of your rig.

If the system does not post with the new RAM removed, power down again and check your power cables. The Doctor has seen it happen plenty of times. You’re mucking around inside of your rig, installing parts, and you accidentally bump a cord.Did you knock the 24-pin main power connector out of place? Could you have possibly bumped any other modules loose?

The Doc thinks you should reseat your RAM, as well as the 12V auxiliary power connector near the CPU.  If you get things running with the new RAM removed, it doesn’t necessarily mean the module is bad. It could be the RAM slot. Try the new stick in another slot—one that has held working RAM, preferably—making sure it is firmly seated before you write the module off completely.

SUBMIT YOUR QUESTION Are flames shooting out of the back of your rig? First, grab a fire extinguisher and douse the flames. Once the pyrotechnic display has fizzled, email the doctor at doctor@maximumpc.com for advice on how to solve your technological woes.

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