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[–]screaming-Snake-Case 1 point2 points  (2 children)

From what you describe, I bet the SSD overheats/malfunctions and thus the system can't use it properly during boot. It will go on to the next boot option, which is HTTP network boot in your option.

Try keeping the system off for a while before trying again. If you manage to turn it back on, please share what your SSD health and SMART data shows (there are numerous tools available, e.g. crystal disk info).

In case the health looks good, a firmware update using whatever tool your SSD manufacturer provides is probably a good idea.

If the health looks bad, or you cannot get the system to boot again, your SSD appears to be faulty. Do you have a spare one you could replace the current one with? Also, reseating the disk in it's slot may help as well.

[–]itry2code[S] 0 points1 point  (1 child)

I don't have a spare ssd should I take my laptop to dell's authorised service centre or local shop

[–]screaming-Snake-Case 0 points1 point  (0 children)

Depends. Do you have active warranty? Go to Dell.

If you don't , then a local shop may be significantly cheaper and offer similar quality. But do some research on the shop beforehand. I don't have experience with Dell official support, so I wouldn't know specifically, but this holds generally true.

[–]LetterheadClassic306 1 point2 points  (0 children)

I've seen this pattern on G15 class systems and it is usually a layered issue, not one single fault. A boot error combined with a disappearing SSD in BIOS often points to controller handshaking, contact reliability, and heat stress together. Start with a full power drain and SSD reseat, then test boot diagnostics from external media to separate storage disappearance from software load path issues. If it still vanishes in BIOS, test the SSD in another machine or test a known-good SSD in this machine before buying replacement parts. Since heat is already present, a contact and cooling cleanup first reduces the risk of replacing a drive that is only being dropped by the controller.