Subj : Re: Dell 780 Problem: To : All From : nospam@needed.invalid Date : Thu Jan 31 2019 19:16:25 Path: eternal-september.org!reader02.eternal-september.org!feeder.eternal-september.o rg!.POSTED!not-for-mail From: Paul Newsgroups: microsoft.public.windowsxp.general Subject: Re: Dell 780 Problem: Date: Wed, 15 Nov 2017 18:14:41 -0500 Organization: A noiseless patient Spider Lines: 85 Message-ID: References: <7f18b466-63df-408a-bab7-4c3213a16544@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Wed, 15 Nov 2017 23:14:40 -0000 (UTC) Injection-Info: reader02.eternal-september.org; posting-host="97aeaa592f71f78b07aa84e71500f94e"; logging-data="20061"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+d9euLK2fV8bLptEq3UtyCVWzMxsnKyKQ=" User-Agent: Ratcatcher/2.0.0.25 (Windows/20130802) In-Reply-To: Cancel-Lock: sha1:cB1QOP8DIRa4bS0z8fq31PQTz94= Xref: feeder.eternal-september.org microsoft.public.windowsxp.general:134563 Mark Twain wrote: > As I said, the beeps are hard to > follow but If I read the beeps > correctly I have a master DMA > register failure. > > That along with the 1 diagnostic > light lit indicating no memory > modules detected. > > Robert Careful. You should not remove a DIMM with the power on. Even if the fans aren't running, the power supply +5VSB is still delivered by the supply. You should unplug the computer before working on DIMMs. That's the only way to be absolutely sure power is removed. On Asus motherboards, a green LED stops glowing, indicating it's safe to work. On motherboards without the green LED, wait at least 30 seconds from unplugging the power supply, until you work on the DIMM. To remove a DIMM, you rotate out the latches to 45 degrees, and that helps ease the DIMM up out of the socket a bit. Once the contacts aren't gripping the DIMM, it should then be able to be pulled straight out. When inserting the DIMM, the center notch has to align with the "key" in the slot. This prevents 180 degree reversal of DIMMs by accident. Visually verify when re-inserting, you're putting it in the right way. (I have to include these instructions, for the sake of completeness.) When inserting the DIMM, the latches go to the 45 degree position. The DIMM is then aligned with the "square" opening in the DIMM slot. The end-guides guide the ends of the DIMM for its downward trip. When you push down on the DIMM (to force the fingers between the contacts), it will cause the latches to rotate into the upright position again. You should hear a "click" when the DIMM is in place, from each end. The latch should be in the upright position, the protrusion on the latch should insert into the area reserved for it on the side of the DIMM. On DIMM slots which use one latch, and the latch nearest the video card is a dud, only one end will be heard to "click". I have a mixture of motherboards here - most have two latches, but at least one I own, has a single latch on each DIMM slot. With a flashlight, look at the fingers on the DIMM. The "gold" should mostly be hidden below the socket body, so you can't really see any gold. If you see a lot of gold glinting back at you, it isn't seated. DIMMs which are finished "flat" on the end, have high insertion force. It hurts your fingers to drive those into the socket. Some of the older memory standards, the insertion force wasn't nearly as high. I have some Kingston DDR2 here, it just about kills me inserting those. You can blow a DIMM or processor interface, if the DIMM falls out with the power on, and something gets shorted together. The most likely way this would happen, is if one end of the DIMM comes loose, while the other end stays in the socket. That should only happen, if the PC is dropped out of a second story window :-) Kneeing the PC should not do that. I wouldn't panic just yet, until thoroughly verifying the DIMM(s) are seated. Remember to unplug the computer. If there was micro-latchup, removal of power gives CMOS circuits a chance to recover. Verify with your flashlight, that each DIMM is fully homed into the socket, and no gold is showing. Paul --- Platinum Xpress/Win/WINServer v3.1 * Origin: Prison Board BBS Mesquite Tx //telnet.RDFIG.NET www. (1:124/5013) .