Lg reboot wont go in to download mode

as you have just said safe mode will be your next step.

Turn on safe mode

1. Turn off your phone and reboot.
2. When you see the LG logo, press and hold the Volume Down key until you see the home screen.
3. Your home screen displays Safe mode in the lower left corner as shown.

Uninstall third party apps

1. From any Home screen, tap Apps.
2. Tap Settings.
3. Scroll to 'APPLICATIONS,' then tap Application manager.
4. If necessary, swipe right to the Downloaded screen.
5. Tap the desired application.
6. Tap Uninstall.
7. Tap OK.

Turn off safe mode To turn off safe mode, follow these steps:

1. Press and hold the Power key.
2. Tap Power off and restart.
3. The device restarts in standard mode.

here u can boot the system in safe mode, with switch on and press f8 for safe mode boot click start than run msconfig -on start up tab un select all and apply than reboot in normal mode now u c all infected running file are closed now u download or install online AV for ur pc & lappy----thanks enjoy

if you wont mind losing your data that are not backup... you can simply perform a hard reset to factory settings. 1. remove the battery 2. re-instert the battery 3. hold VolumeDown button then press the power button Do not release the volumedown key til u get to recovery mode Now that you are in recovery mode, first try WIPING CACHE and then reboot your phone. if the problem persist, then repeat step1-3 again this time, select WIPE DATA FACTORY RESET if wiping cache solves it, then your data are intact WIPING DATA FACTORY RESET wil return ur phone to new without losing any unlocking feautures. i'm McKennie
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Disconct wireless devices...connect to pc via cable...Go to SSID settings... change bandwidth from 20/40mhz to 20mhz only ... rebooting issue will be soloved... link speed will show 65-150 Mbps .. bt dont worry.. u will get the whole bandwidth available .... after that reconnect wireless devices ... it wont reboot by itself ...

remove memory card and reboot.

reboot PC in save mode and set the resolution to 640 x 480 @60Hz, reboot in normal mode and reset the resolution to the native resolution of the monitor (you need to find out what that is in the monitor owner manual).

here http://www.generalmanual.com/Mobile-Phones/LG-Rumor-Mobile-Phone.htm
you can download (under "download now" near the bottom of the page) the manual find answer about rebooting problem.
Hope it helped you!

install malewarbyes reboot in2 safe mode and do a fulll scan
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?part=dl-10804572&subj=dl&tag=button

drivers are not needed in order to cd to work, but this problem has aleazrdy been registered.
you shoul click on START, RUN, and type "regedit"
then search in the tree the branch
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
in this, remove the Upperfilters & Lowerfilters values.
reboot, it should work
if really not working after that, download and install the firmware update you can download at http://drivers.softpedia.com/get/FIRMWARE/LG/LG-GSA-H21N-Firmware-A03.shtml