"scbs29" wrote

| Literally between switching off at night and restarting next morning I
| started having problems booting up. It can take anything up to 5
| or 6 tries before I succeed. This has been going on for 4 days.
| There have been no changes to software or hardware for at least
| 3 months.
|

I think Weatherman's suggestion is a good idea to start.
If that doesn't work, try removing one at a time. You
could also try memtest86. I don't know whether windows
memory check is any good but I wouldn't trust it.

If that doesn't solve the problem, look up the error
codes. Advice like running chkdsk rarely solves anything.
It's just generic advice, like, "Confirm that your TV is
plugged in". But error codes are extensive and can be
very informative. It will be 1 32-bit integer in base-16
format, followed by 4 more. Like:

0xC0054113{0x00003412........ etc.

The "0x" is just notation. The 8 characters following are
the number. Often the "high word", the first 4 characters,
represent a category.
I often just copy part of the whole error code text and
search for that. Usually someone has had the same errors
and reprinted them online as they looked for an answer.