USB / PS2 (power?) errors with Win 7 install.

Hey all, just been trying to install Win 7 on parents PC, and getting some issues that are annoying me, can't tell if just a driver issue but becoming less likely, wondering if anyone here knows...



Background: Had an old MSI AMD (AM2?) board with a dodgy capacitor (near the CPU) but seemed to work fine. I added a new 840 SSD and sata DVD drive (with molex to sata adapter), and suddenly mum finds it doesn't fully shut down when shutting down - the screen turns off but all fans, inc cpu fan, still running. have to hard off. figured no probs as I was about to replace mobo anyway...



So, today I put in a GA-MA78G-DS3H (AMD 780G / SB700), with 5200+ and 4GB ram in (all previously in use fine in my own PC), and connected to all her current drives (originally 2 HD, 1 SSD, 1 DVD, though I've since removed the two HDs), Radeon 240, and 430w PSU (coolermaster - shoot me). Not exactly power hungry though.



Also has PS2 MS keyboard and USB MS wheel mouse optical connected.



First boot is fine, BIOS stats look good, so I stick in the Win 7 install disk and it all starts going tits up.



- As soon as "Starting Windows" logo pops up, the USB mouse light goes out, and doesn't function. I figured driver issue. Rebooted from the install options, the screen hung, then BSODs with a USB0000... driver error.

- On another boot to install CD, it errored out before doing anything with a black error screen about a connected USB device. At this point I drag the mouse out and continue with the install.

- After full install, I reconnected the mouse, and auto driver install searches windows update forever for drivers, eventually brings up a drivers installing screen, and then hangs (albeit with animted loading circle) requiring hard reboot.

- I give up, and get my USB to PS2 adapter for the mouse, which works fine, once.

- Other USB keyboards/mice I tried (bluetooth and wireless via dongles) didn't do anything (no driver loading / nothing).

- After another reboot, the mouse stops working again (no light, no movement), another reboot and the keyboard stops working too.

- And here's where it gets worse - I boot in to BIOS, and now the keyboard is playing up, with some button presses not registering, and some other keys mixing up (eg. Left = Up, sometimes, sometimes = Down, sometimes Left, sometimes nothing, whatever. Same with every key).



So I figure that rules out pure Windows driver issues (although possibly this for the USB - http://ift.tt/18Pu5uE ) . I've given up for the night, gonna try my own keyboard and mouse tomorrow, but what gives? Something dodgy with PSU (weird electrical interferance, not enough power for devices / i/o chips)? Weird windows / 780G issue? Dodgy wiring (the molex to sata adapter was cheap...)? Dodgy peripherals (they were fine until the windows install)? Just bad luck?

USB / PS2 (power?) errors with Win 7 install.