HDD's recently removed to backup data using a usb caddy to another pc. HDD's appear to be working fine, extracted all data ok. When pressing the power button, all the light come on, and laptop appears to be running. But no display on the monitor, not even Bios. It then Cyclic reboots after a minute or so, but still not display.

If anyone had any ideas!

Thanks

well first unplug the HDD and press the power button. After it loads windows plug your USB. My IDE 2 USB adapter works that way .