Beep Beep Beep ... Amy's Ram went squish

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The other day I powered up Amy, one of the PC's I use for games (currently it has Sims 2 and Settlers, i'll be putting some other games on there eventually, and maybe MSDN). Amy hadn't been powered up for over a year (July 2024, according to Event Log). I'd opened it up to add a 500GB SATA HDD, then after recycling my iMAC (see appropriate Sheila Holmes and Dr. Wanda drawing with an HDD on the front) I opened Amy again and removed the (unformatted) 500GB HDD and put in the (DBAN'd) 160GB that I removed from the iMAC. Then two days ago I removed the (still unformatted) 160GB HDD and put in the 750GB SATA HDD which contained a copy of my main backups (grandfather-father-son). I'd already copied the backups onto my iOmega network drive (so I can read them from all my PC's without having to fiddle round with unreliable USB cabling).
Anyway, having put the 750GB SATA HDD in Amy, I closed the case and powered it up. Beep Beep Beep! Three long beeps normally means RAM Failure. But also the CD-ROM drive wouldn't open. So I got out my Radio Shack DVM and checked the +5 and +12 voltages. +5 OK, +12 read as 11.3V. So I think "That's a bit low, maybe the PSU is getting flaky". Just to check the CD-ROM drive wasn't faulty I power it up from Cairoline's PSU (my test machine, DOS 5, etc). Now the drive opened OK, so I change Amy's PSU. I look through my big crate of PSU's for one with a 24 pin ATX connector and a SATA cable, but it's only 300 watts. So I open up FNIS (another PC I got from a certain card-processing company I did some work for), take out its 400 watt PSU, and put it in Amy. I clean the GeForce GPU, put it all back together, and Beep Beep Beep. So it wasn't the PSU it was the RAM. So I open up my unused MS-W10 HP spares machine and take out a 1GB stick of DDR2, and put it in Amy. It now boots OK (yay), but I only get VGA output, not HDMI. After running a disk check on the 750GB HDD I open it up again and push the GeForce down into the PCI-E slot properly (it was loose!). So anyway it all works now (yay). I put the 300 watt PSU into the FNIS machine (which I hardly use), and tidy everything up. So that was my Friday night/Saturday morning. Oh, regarding RAM failures. The previous one was several years ago, when a 1GB stick failed in my Vista machine. So luckily it doesn't happen all that often.