Why won't Windows 7 boot up after cleaning my laptop?

Question

Iron

Previously, I asked a question, but there have been changes, and so:
The laptop was cleaned, after which, when Windows started loading, there was an inscription "Loading Windows" a black screen appears. Laptop stuck on black screen.
An attempt to restore the system - a black screen, the cooler stops spinning, there is no system operation.
Trying to boot Windows from scratch through a boot disk is the same. black screen and silence.
I climbed into the BIOS, everything went wrong there, time, dates, etc., I tried to set it up but to no avail.
Please help me solve the problem, since there are no ideas what it could be, most likely the BIOS itself flew, because when you tried to turn on the laptop earlier, even it did not work and I had to reset it.

Answer 1

Don't bother flashing the bios. Before that, it worked, so the worker is the time. The second - if you cleaned it yourself, but it seems like you yourself, then gently sort out the laptop again, go over the boards on both sides with a brush. Good advice with memory - with an eraser (school eraser for erasing a pencil), go through all the contacts and also clean with a brush, blow off the excess, see that it doesn’t get inside.

Answer 2

Was there a cleaning of the iron, not a soft one?
Then it makes sense to check the connection of the operative - the mb contact has oxidized, or dust has got into the connector. Take out all the bars except for one, try to start it, if it doesn’t work out, rearrange the only bar into the next slot. Started - excellent, identify the cause by replacing / adding slats.

Answer 3

I would advise you to check your memory. Try downloading memtest86 and running the tests.