Laptop keeps rebooting at startscreen its stuck in a reboot loop
I work at a pawnshop and repair laptops now we got in this Samsung Ultrabook 5 Series. And i got this weird problem going on.:
The laptop keeps rebooting at startup. I cannot enter the recovery state (F4) but i can access the bios (F2). I have tried everything but nothing works.
The weird part is that when i choose in the BIOS to boot trough a UBS with windows 7 it boots the USB and installs windows fine :S As soon as i remove the USB and ask the laptop to startup from HD it keeps rebooting again. But if i put the USB back in and don't push a button to access startup it boots back to WIN7 :S
I have installed another HDD, Replaced the battery. changed RAM. In windows did an error check but there is nothing wrong with it!!!! I Updated the BIOS, removed battery and pressed the "power on" for 1 minute.. nothing seems to work.
Thanks in advanced for the help.