I am seeing the samething. One minute the magic mirror was great, so rebooted and now it just loads a white screen.
the Only changes i have made to the MM code is the custom Weather api, and ical.

I was thinking maybe unclutter was causing the screen to white out so i removed it. no changes. any help would be awesome! :)

Debug logs
0 info it worked if it ends with ok
1 verbose cli [ ‘/usr/bin/nodejs’, ‘/usr/bin/npm’, ‘start’ ]
2 info using npm@3.10.8
3 info using node@v6.9.1
4 verbose run-script [ ‘prestart’, ‘start’, ‘poststart’ ]
5 info lifecycle magicmirror@2.0.0~prestart: magicmirror@2.0.0
6 silly lifecycle magicmirror@2.0.0~prestart: no script for prestart, continuing
7 info lifecycle magicmirror@2.0.0~start: magicmirror@2.0.0
8 verbose lifecycle magicmirror@2.0.0~start: unsafe-perm in lifecycle true
9 verbose lifecycle magicmirror@2.0.0~start: PATH: /usr/lib/node_modules/npm/bin/node-gyp-bin:/root/MagicMirror/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
10 verbose lifecycle magicmirror@2.0.0~start: CWD: /root/MagicMirror
11 silly lifecycle magicmirror@2.0.0~start: Args: [ ‘-c’, ‘electron js/electron.js’ ]
12 info lifecycle magicmirror@2.0.0~start: Failed to exec start script
13 verbose stack Error: magicmirror@2.0.0 start: electron js/electron.js
13 verbose stack spawn ENOENT
13 verbose stack at ChildProcess. (/usr/lib/node_modules/npm/lib/utils/spawn.js:33:16)
13 verbose stack at emitTwo (events.js:106:13)
13 verbose stack at ChildProcess.emit (events.js:191:7)
13 verbose stack at maybeClose (internal/child_process.js:877:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:226:5)
14 verbose pkgid magicmirror@2.0.0
15 verbose cwd /root/MagicMirror
16 error Linux 4.4.30-v7+
17 error argv “/usr/bin/nodejs” “/usr/bin/npm” “start”
18 error node v6.9.1
19 error npm v3.10.8
20 error file sh
21 error code ELIFECYCLE
22 error errno ENOENT
23 error syscall spawn
24 error magicmirror@2.0.0 start: electron js/electron.js
24 error spawn ENOENT
25 error Failed at the magicmirror@2.0.0 start script ‘electron js/electron.js’.
25 error Make sure you have the latest version of node.js and npm installed.
25 error If you do, this is most likely a problem with the magicmirror package,
25 error not with npm itself.
25 error Tell the author that this fails on your system:
25 error electron js/electron.js
25 error You can get information on how to open an issue for this project with:
25 error npm bugs magicmirror
25 error Or if that isn’t available, you can get their info via:
25 error npm owner ls magicmirror
25 error There is likely additional logging output above.
26 verbose exit [ 1, true ]