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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.
noelmcg
Posted 2016-08-24T12:36:14.883
Reputation: 163
2Have you run any kind of memory or built in diagnostics? – GuitarPicker – 2016-09-03T12:46:04.067
1Go into BIOS and reset all defaults and make sure it sees the HD and run an HD test from there if one is available. Consider cracking open the enclosure of the laptop and inspecting for visual damage or heat checks, swollen capacitors, etc. Be sure you'd blown out the enclosure with compressed air too in case dust is restricting air flow causing overheat damage and/or issues. Take the HD out and see if the DVD or CD or USB will boot from there. Same with memory module, remove and reboot and see if it'll boot with one or the other, reseat he modules as well as the HD... quick ideas... – Pimp Juice IT – 2016-09-03T19:20:48.070
Did the PC ever work properly with Win 7, or is this a new install? – Randy Schuman – 2016-09-05T06:07:31.157
Did you try to start the system without the graphic environment or "in safe mode"? If I've to guess I pick the video card, or its driver. You may try to boot via USB with a different system with and without graphic environment. If starts with Linux and not with Windows it is not an hardware issue (look in drivers & settings). If it doesn't start in any way it should be an hardware or a Bios settings issue. If it starts only without graphic environment in both system it should be again an hardware issue... There are even diagnostic systems that boot from USB that should make tests for you. – Hastur – 2016-09-05T06:22:12.230
@noelmcg It would be helpful if you shared what kind of laptop you have, IE, make and model of it. – Frostalf – 2016-09-05T06:27:23.770
@Frostalf Win 7, Toshiba Satellite - C850D-11Q, I did mention it at the start of the question but I've added the specific model now. – noelmcg – 2016-09-05T09:31:21.660
@RandySchuman yes, laptop worked properly under Win7 – noelmcg – 2016-09-05T09:31:57.153
@PIMP_JUICE_IT going to follow your instructions cheers – noelmcg – 2016-09-05T09:32:39.680
@Hastur going to follow your instructions also thanks – noelmcg – 2016-09-05T09:33:21.450
1If this doesn't work then it may be worth taking it to a specialist as the thermal paste may have dried up/cracked and is no longer transferring the heat from the CPU efficiently enough to the heatsink. This will cause the CPU to turn on then quickly off as it will have reached it's safety cut-off temperature. – Kinnectus – 2016-09-05T09:49:26.913
F12 (or some Fx) for boot menu probably does not work too? – Vojtěch Dohnal – 2016-09-05T09:59:30.497
Have you tried to use another bootable CD/DVD? Can you boot from a USB-drive? – Orphans – 2016-09-05T10:24:36.870
have you tried running memtest? (i suppose this may not work since it likely won't boot to memtest). Alternatively, you can try swapping out the ram – Blaine – 2016-09-05T13:11:55.270
@PIMP_JUICE_IT tried your recommendations but alas no joy, cheers all the same – noelmcg – 2016-09-05T14:55:29.220
@BigChris I followed your suggestion, and replaced the thermal paste but alas no joy. – noelmcg – 2016-09-05T14:56:36.930
@Orphans I cant use any diagnostic tools as I cant boot into USB DVD – noelmcg – 2016-09-05T14:59:52.730