My laptop (Win 7, Toshiba Satellite – C850D-11Q) is having issues with booting up.
If I try to boot normally the screen appears to turn on for 1-2 seconds, then off again and loops like this continually. If I try to boot from DVD, its the same. The laptop is in a loop, as opposed to the screen not working, as I can enter the BIOS after it has restarted as described.
I can enter startup disk, but unfortunately if I try to boot by USB I remain in the bootup loop.
Due to the above I can run any diagnostic checks using DVD/USB and there does not appear to be any built in checks built into the BIOS.
I've removed the HDD, checked using Disk Utility on OSX, and it appears to be fine.
I can boot into BIOS as normal. Which would suggest that the screen isn't the issue.
Any advice as to what the issue may be would be greatly appreciated.
Many thanks
Noel
UPDATE:
Followed PIMP_JUICE_IT suggestions, checked for damage, cleaned out dust, removed HDD/RAM,
As Big Chris suggested I tried removing and replacing the thermal paste, cleaned fan/radiator, but unfortunately the problem remained.
Best Answer
Apologies, it appears to be a battery issue. I removed the battery and the laptop boots up fine. I can't confirm that it is completely the battery at this stage, as I haven't used a replacement, but it appears to be looking very likely.
I completely overlooked this, as it booted up into the bios fine. I assumed that this wouldn't have been causing the issue as it would have prevented the bios from booting up fine also.
Hope this may be of some benefit for anybody else in the same predicament.
Also, the following question that I recently found after I asked the above question is also helpful:
How to Diagnose a Pre-Operating System Load or Hardware Issue