Windows 7 ultimate x64. bios modded. this is the first time it happened ever window 7 first public in here.
The picture is that an intel screen? / How far does it get in boot? / At this point I don't think there is any problem with Mod. Can you make repair disk? or have you done already?
Try resetting the CMOS. Remove the battery and disconnect the power for a few minutes, reinsert the battery and power, and reboot. This is the simplest way of resetting the CMOS. Your motherboard may have another way that you can also do it, but this way is universal. If it still doesn't boot, its definitely a hardware issue. If any of your HDD's or optical drives etc are faulty or not plugged in properly this may cause a freeze. Unplug all of them and see if it boots then. If still no luck, remove one memory module (if you have more than one, which you should do!), and try again. If still no luck, remove that module and place the other one back in the other slot and try again. If still no luck, unplug all USB devices, PCI/PCI-E cards if present, just leaving 1 stick of memory and the GPU card. If it still doesn't boot then its likely a bios issue, if it does boot gradually reconnect things until the offending hardware is found. Hopefully if it is a bios issue you can at least be able to run a bios recovery method on it (motherboard dependent), but you will need to look up the correct procedure for you.