How to Enable VT on a Sony Vaio SZ430N

These instructions are adapted from bogart's instructions on notebookreview. The way I did this was to boot the laptop into DOS using a linux PXE boot server. You will need another linux box on your network. I used a desktop PC running Fedora 8, but these instructions could probably be adapted to work with other linux distros.

Boot the Laptop into windows. Run the bootdisk.exe from here:
```
http://www.esupport.com/techsupport/award/bootdisk.htm
```
Copy the image to your linux box as /tftpboot/dosimage.IMZ. unpack it like this:
```
gzip -dc /tmp/dosimage.IMZ > /tftpboot/dos.img
```
NOTE: any ideas on how to do this step without using windows? Maybe there's a better way to get a good DOS image.
On your Fedora linux server, Install the necessary packages:
```
 yum -y install tftp dhcp xinetd wget 
```
Disable any other dhcp servers you might have in your network.

Set up your /etc/dhcp.conf . You may need to modify this to suite your network:

allow booting;
allow bootp;
ddns-update-style interim;
ignore client-updates;

subnet 10.0.0.0 netmask 255.255.255.0 {
          option subnet-mask 255.255.255.0;
          option broadcast-address 10.0.0.255;
          range dynamic-bootp 10.0.0.100 10.0.0.199;
          next-server 10.0.0.20;
          filename "pxelinux.0";
}

Mount the DOS image:

mkdir /dosimage
mount -o loop /tftpboot/dos.img /dosimage

On the linux server, download PEDIT from http://www.goldshell.com/pedit
```
unzip pedit.zip
cp PEDIT.EXE /dosimage
```

download symcmos to the DOS image:

cd /dosimage 
wget ftp://ftp.supermicro.com/utility/symcmos.exe

unmount the DOS image:
```
umount /dosimage
```

set up pxelinux:

mkdir /tftpboot/pxelinux.cfg
cp /usr/lib/syslinux/pxelinux.0 /tftpboot
cp /usr/lib/syslinux/memdisk /tftpboot
vi /tftpboot/pxelinux.cfg/default

It should look like this:

DEFAULT pxeboot
TIMEOUT 50
LABEL pxeboot
      KERNEL memdisk 
      append initrd=dos.img
ONERROR LOCALBOOT 0

Open up your firewall, if necessary:

/sbin/service iptables stop

Start up the boot servers:

/sbin/service dhcpd start
/sbin/service xinetd start
/sbin/chkconfig tftp on

Make sure your laptop has the R0112N0 firmware installed. Go into the BIOS and reset it to factory defaults. Enable the "Network Boot" option. Make sure the laptop is connected to the same network as your PXE boot server. Reboot, and hit F12 to boot from the network. You should boot into a DOS A:> prompt Dump the BIOS settings:
```
A:> symcmos -v2 -lDefault.txt
```
Edit the settings:
```
A:> pedit Default.txt
```
Change (0354) [0000] to (0354) [0001], and save the file (ALT-F, select save)
Now, write the modified settings back to the BIOS:
```
A:> symcmos -v2 -uDefault.txt
```
reboot the laptop (I had to use the power button), and you should be all done.